alka seltzer science experiment

How to Make Alka Seltzer Rockets with Film Canisters

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Need a fun STEM activity for kids? Making these Alka Seltzer rockets fits the bill! This is one of my favorite science experiments! Read on to find out all about them including how they work, how to make them, and how to decorate them as well as some helpful tips.

When I first wrote this post back in 2013, I only talked about film canister rockets. As I'm updating this post in 2021, I decided to experiment with some alternative types of containers.

I tried three options–large 1.77 oz. mini M&M container, small 1.08 oz. mini M&M container, and the small, party favor-sized Play-Doh containers. The only one that worked was the small M&M container, and it didn't go very high–maybe 3 or 4 feet.

Frankly, I would order the film canisters. They go 15 or 20 feet into the air! Much more impressive than 3 or 4 feet. 🙂

There are several options for film canisters on Amazon. Read the recent reviews to find the ones that worked well when used for this purpose.

How Alka Seltzer Rockets Work

The Alka Seltzer antacid tablets are made of aspirin, sodium bicarbonate (which is baking soda), and citric acid. When they are dropped into water, a chemical reaction takes place, and bubbles of carbon dioxide gas are released.

The gas builds up until there is enough pressure to blow the film canister lid off and propel it into the air. It's Isaac Newton's third law of motion in action: “For every action there is an opposite and equal reaction.”

Click the image below to watch my YouTube video with lots of launches!

Supplies Needed

• Film Canisters – The ones where the lid fits inside the canister. The other kind won't work. See the image below.
• Alka Seltzer table t s – Generic brands also work. See the note below.
• Safety goggles or safety glasses

Note: Because the antacid tables contain aspirin, make sure the kids know not to put them in their mouths.

That's really all you need for the project. But to make the canister look like a real rocket, you can decorate it.

If you decide to decorate the rockets, you'll need:

• Paper or printed template
• Crayons , markers , or stickers for decorations

How to Decorate the Alka Seltzer Rockets

You can color or draw on a piece of printer paper. Turn the canister upside down and tape the paper around it. Make sure that the lid of the canister is sticking out of the end of the paper so that you can easily remove the lid.

Another decorating option is to print this template and cut out and attach the rocket body, fins, and nose cone. You can download the templates by entering your email address below.

You can pick the color you want or just print the black and white version for the kids to decorate themselves.

How to Use the Film Canister Rocket Templates

• Print off one of the templates and cut it out along the solid lines. Fold along the dotted lines.
• Tape the body around the canister making sure the open part of the canister is pointing down.
• Roll the nose into a cone, center it on the canister and tape it down.
• Fold the fins so that they form a circle and tape them together. Slide the fins onto the bottom of the canister (open end).

If you are “spatially challenged” like I can be, practice folding the fins and wrapping the body around the canister. Once you get the hang of it, it's easy, but you'll need to know how to do it so that you can show the kids. The video below shows you how to put them together.

How to Launch Your Alka Seltzer Rockets

You need a relatively flat surface as your launch site, so we used a flat part of our driveway.

First, make sure everyone is well away from the launch site except for the person whose rocket is about to launch. Have that person put on the safety goggles.

Turn the rocket upside down and pour water into the container. The amount of water you use will determine the launch height, so only fill the container about 1/4 to 1/3 full.

You don't need a full tablet of Alka Seltzer–use 1/2 of one. Drop the tablet into the water and quickly put the lid on. Make sure the lid snaps completely into the container.

Then move quickly away from the launch site.

You'll be surprised at how high these can go when you don't use too much water.

Antacid Tablet Rocket Tips

• Tape the fins onto the canister well or they'll fly off during the launch.
• Use only a little bit of water (1/4 to 1/3 full) for the most height. If your rocket isn't going very high, try again with less water.
• When you tape paper onto the canister, make sure it doesn't go over the edge of the container. Leave a little room so that the lid will snap on easily.
• You can use the Alka-Seltzer piece a second time. It will most likely be laying on top of the lid at the launch site.

Get your Printable Alka Seltzer Rocket Templates

Enter your email to get your Printable Alka Seltzer Rocket Templates!

If you don't get an email within 10 minutes, check your spam folder. If it isn't there, let me know at [email protected] .

This is an awesome STEM activity to do with just one or two kiddos, but it also works great for Scout meetings .

Making these rockets can be done at a den or pack meeting . If you're having a rocket academy , you'll definitely want to include this. You could even make these rockets during your Space Derby.

The activity was such a hit at a Bear den meeting that I decided to do it with all the Cub Scout ranks during our Cub Scout Day Camp . 200 Scouts with 200 rocket explosions was so much fun!

Have your kids made Alka Seltzer film canister rockets? What did you do differently that worked well?

Yours in Scouting, Sherry

Alka Seltzer Film Canister Rockets

• Make a fun Alka Seltzer film canister rocket with your kids! You'll be amazed at how high they go!
• Film Canisters
• Alka Seltzer Tablets
• Safety Goggles
• Paper or Printed Template

Instructions

• Set the rocket on a flat surface such as a sidewalk or driveway, and step quickly away from it.

P.S. If you would like to see a great family movie with some Scouts building rockets, check out my movie and book recommendation .

Gili Segall

Tuesday 27th of June 2023

This rocket activity looks amazing and I would love to try it with my boys but unfortunately the template for the rocket has not arrived. I did check my spam folder too but it is not there either. PLease could you send it to me at this email address

Kimberly Chromicz

Wednesday 28th of June 2023

Hi there! I've emailed you the alka seltzer rocket template. Enjoy!

Tara mayhew

Thursday 15th of June 2023

Can you send me a copy of the printable Alka-Seltzer rocket template. Thank you

How to Make Easy Cub Scout First Aid Kits ~ Cub Scout Ideas

Wednesday 17th of August 2022

[…] First, pick out your container. There are so many options that you can use for your mini first aid kit. You can make them out of everything from duct tape to ziploc bags to film canisters. […]

The Family Summer Bucket List that Won't Break the Bank

Tuesday 27th of July 2021

[…] Film canister rockets cost less than a dollar to make. They are not the most dangerous thing you can launch, (I know many kids are saying but we want explosions!) but they are fun for kids and adults alike! The best part is that this activity will keep your family entertained for hours (or at least long enough to get through dinner)! […]

The Ultimate Guide to How and Why to Interlink Blog Posts ~ Easy Blog School

Thursday 22nd of July 2021

[…] Here's another example from my post about Alka Seltzer rockets on Cub Scout Ideas. […]

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Alka Seltzer Rockets

Simple science and a cool chemical reaction with an easy DIY Alka Seltzer rocket ! Kids and adults will have a blast with this cool kitchen science experiment. A few simple ingredients and you have chemistry in action. We love fun and easy science experiments anyone can try out!

Explore Alka Seltzer Science For Kids

Oh boy! Get ready for some fun with this Alka Seltzer Rocket. EASY setup and simple to do! Your kids will be asking you to repeat it over and over again. I know; mine did!

This Alka Seltzer rocket is super cool science with just a few simple household ingredients. Learn and play at home or in the classroom.

Our science activities have you, the parent or teacher, in mind! Easy to set up, and quick to do, most projects will take only 15 to 30 minutes to complete and are fun! Our supplies lists usually contain only free or cheap materials you can source from home.

Check out all our chemistry experiments and physics experiments !

Grab some Alka Seltzer tablets and film canisters, and follow our step-by-step instructions to make an Alka Seltzer rocket that will blast off!

Also check out how to make a water bottle rocket with baking soda and vinegar!

Introducing Science To Kids

Science learning starts early, and you can be a part of that with setting up science at home with everyday materials. Or you can bring easy science experiments to a group of kids in the classroom!

We find a ton of value in cheap science activities and experiments. All our science experiments use inexpensive, everyday materials you can find at home or source from your local dollar store.

We even have a whole list of kitchen science experiments , using basic supplies you will have in your kitchen.

You can set up your science experiments as an activity focusing on exploration and discovery. Make sure to ask kids questions at each step, discuss what is happening, and discuss the science behind it.

Alternatively, you can introduce the scientific method, get kids to record their observations and make conclusions. Read more about the  scientific method for kids   to help you get started.

Helpful Science Resources To Get Your Started

Here are a few resources to help you introduce science more effectively to your kiddos or students and feel confident when presenting materials. You’ll find helpful free printables throughout.

• Best Science Practices (as it relates to the scientific method)
• Science Vocabulary
• 8 Science Books for Kids
• All About Scientists
• Science Supplies List
• Science Tools for Kids

What Makes Alka Seltzer Rockets Erupt?

This Alka Seltzer experiment is all about the chemical reaction between the tablet and the water. When the chemical reaction occurs, a gas called carbon dioxide is released.

We tried this experiment first without the lid to see what would happen! You can observe the gas from the bubbles formed.

However, with the lid on tight, pressure from the build up of gas occurs and the lid explodes off. This is what sends the canister into the air like a rocket! So much fun!

Click to get your FREE STEM Worksheets pack!

Alka Seltzer Experiment

Don’t have alka seltzer tablets? Check out our baking soda and vinegar bottle rocket !

*Please Note* This is a fully adult supervised science experiment. The Alka Seltzer rocket has a mind of its own. Have your child wear safety goggles at all time.

Older children will be able to assemble the Alka seltzer rocket. Please use your best judgement regarding your child’s ability to handle the materials.

• Alka Seltzer tablets
• Film canister or similar size container. What we are using is actually from the dollar store and sold in packages of 10. Make a rocket for everyone!

How To Make Alka Selzter Rockets

We tried it a few different ways and re-used the still fizzing tablets as long as we could. Sometime we had a giant explosion  that hit the ceiling and sometimes it just popped a little.

Step 1: Fill the canister about 2/3 full with water and then drop in 1/4 of an alka seltzer tablet.

Step 2: Immediately tightly cap the canister. This is crucial to the success and you have to work fast.

Step 3: Turn the container upside down and place on a flat surface.

Tip: Take this experiment outdoors for easier clean up unless you have open space and don’t mind the water! See more Outdoor STEM activities!

Step 4: Stand back with protective eye wear on!

Your Alka Seltzer rocket may blast off immediately or there may be a delayed reaction. Make sure to wait long enough before going over to the canister if it hasn’t taken off yet. Give it a nudge with your foot first.

Ultimately, it would go off every time just when I was sure it would not! If the container has to much water in it, the blast off wasn’t as big. Experiment with different amounts of water to tablet!

What does an eruption look like from an Alka Seltzer rocket?

Capturing an Alka Seltzer rocket on camera is not easy since I was the only adult. I often didn’t have enough time to pick up my camera and get ready.

However, I can tell you that the laughter, pointing, and jumping up and down from my son is proof enough. You may even go through a whole package.

More Fun Experiments To Try

Science experiments with ordinary items are the best! You don’t need fancy science kits when you have cupboards full of great stuff to use!

• Volcano Eruption
• Dancing Corn
• Elephant Toothpaste
• Lava Lamp Experiment
• Gummy Bear Osmosis Lab
• Diet Coke and Mentos Experiment

Printable Science Projects For Kids

If you’re looking to grab all of the printable science projects in one convenient place plus exclusive worksheets, our Science Project Pack is what you need!

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Explore the natural world through science and sustainability

How to Conduct an Alka-Seltzer Rocket Science Experiment

Do you have a plastic bottle and some Alka-Seltzer tablets? Then you have the materials for an Alka-Seltzer rocket science experiment! Read on to learn how to transform a single-use plastic water bottle into a rocket using simple chemistry.

There are a few science experiments that never get old. One of them is launching a homemade rocket high into the air (or onto the roof of my house) and then watching it plummet down to the ground. My kids have had a blast (pun intended) making rockets out of plastic water bottles since they were toddlers. One of the great things about this science activity is that it requires only four household materials:

• Single-use plastic water bottle
• Alka-Seltzer tablet
• Wine cork or bottle stopper

From a sustainability point of view, this is a wonderful way to reuse wine corks and single-use plastic water bottles to learn some basic science principles! One could even argue that, since we are reusing water bottles, they are no longer classified as single-use plastic, which is a win for the environment.

How Does Alka-Seltzer Work?

Alka-Seltzer is a brand of antacid and pain reliever that works by reducing acid in the stomach and relieving pain. It contains three active ingredients: aspirin (C 9 H 8 O 4 ), sodium bicarbonate (NaHCO 3 ), and citric acid (C 6 H 8 O 7 ).

The aspirin in Alka-Seltzer acts as a pain reliever and fever reducer. It works by blocking the production of certain chemicals in the body that cause pain and inflammation.

The sodium bicarbonate in Alka-Seltzer is an antacid that neutralizes stomach acid. This helps to relieve symptoms of heartburn, indigestion, and upset stomach.

The citric acid in Alka-Seltzer reacts with the sodium bicarbonate to produce carbon dioxide gas. This creates a fizzing sensation, which can help to break up and disperse the medication in the stomach, making it more effective.

What Happens When Alka-Seltzer is Put in Water?

When Alka-Seltzer is put in water, it begins to dissolve and react with the water, producing carbon dioxide gas. The reaction between the dissolved sodium bicarbonate and citric acid in the tablet produces sodium citrate, water, and carbon dioxide gas, according to the following chemical equation:

NaHCO 3 + C 6 H 8 O 7 → Na 3 C 6 H 5 O 7 + 3H 2 O + CO 2

The carbon dioxide gas produced during this reaction is responsible for the characteristic fizzing and bubbling that is observed when Alka-Seltzer is added to water.

If you’ve tried making homemade bath bombs with my “ How to Explain the Chemistry of Bath Bombs ” experiment, you may notice a striking similarity: both Alka-Seltzer tablets and my DIY bath bomb recipe rely on two main ingredients – baking soda and citric acid! The chemical reaction between these two substances is responsible for the characteristic fizzing and bubbling of bath bombs, which is precisely the same reaction we see when Alka-Seltzer is mixed with water.

How Can Alka-Seltzer Be Used to Make a Bottle Rocket?

Alka-Seltzer tablets can be used to create a simple chemical reaction that produces carbon dioxide gas, which can be used to propel a small plastic bottle rocket. The carbon dioxide gas produced by the reaction between the Alka-Seltzer and water builds up inside the bottle, creating pressure. Eventually, the pressure becomes strong enough to push the water and the stopper off the top of the bottle, propelling the bottle into the air like a rocket.

What Type of Plastic Bottle Works Best for an Alka-Seltzer Bottle Rocket?

The type of plastic bottle you use to build your Alka-Seltzer-fueled bottle rocket makes a difference. There are 2 key differences between single-use plastic water bottles and single-use plastic soda bottles that will affect the performance of your science project.

Consider the Material of the Plastic Bottle

Single-use plastic water bottles and plastic soda and juice bottles are made from different types of plastic. Water bottles are typically made from polyethylene terephthalate (PET) plastic, which is a lightweight and durable plastic that is also used for food packaging. Soda and juice bottles are often made from a type of plastic called polyethylene (PE), which is also lightweight and durable but has different properties than PET. Due to the acidic nature of soda and juice, the plastic bottle must be resistant to degradation.

Consider the Contents of the Plastic Bottle

Soda bottles are designed to hold carbonated beverages, which means they need to be able to withstand higher pressure than water bottles. As a result, soda bottles are often made with thicker walls and a stronger structure than water bottles.

Plastic Water Bottles > Plastic Soda and Juice Bottles

When choosing which type of plastic bottle to reuse to make an Alka-Seltzer-powered bottle rocket science project, it is best to choose a single-use plastic water bottle. Since we are defying gravity by launching the bottle rocket into the air, we want to use the most lightweight bottle we can find. We are also capitalizing on the bottle not being able to withstand increased pressure, as the forced release of pressure out of the bottle is what will propel our science experiment into the air. 

Learn more about different types of plastic and how they are made here . 

Materials Needed to Conduct the Alka-Seltzer Rocket Science Experiment

Here are the supplies you will need to make a rocket out of a bottle:

• 0.5 L (~16 oz) single-use plastic water bottle 
• 1-2 Alka-Seltzer tablets
• Cup that is approximately the same size as your water bottle
• Safety goggles
• Optional: fins and decorations for your rocket – free, printable fin template here

Instructions to Conduct the Alka-Seltzer Rocket Science Experiment

Once you have gathered your materials, follow these step-by-step procedures to conduct your rocket experiment. This science experiment is ideally suited for an outdoor environment, or an area with a lot of empty vertical space, like a gymnasium. I recommend launching the water bottle rockets outdoors, as you can avoid the water clean-up that will be created!

• Put on safety goggles to protect your eyes.
• Place the cup on a flat surface. This will serve as your launch pad.
• Fill the plastic water bottle about one-third full with water.
• Break an Alka-Seltzer tablet into a few small pieces.
• Drop the Alka-Seltzer pieces into the bottle of water.
• Quickly insert the wine cork into the bottle and place the bottle upside down in the cup.
• Stand back and watch as the rocket takes off!

The carbon dioxide gas produced by the reaction between the Alka-Seltzer and water builds up inside the bottle, creating pressure. Eventually, the pressure becomes strong enough to push the water and the cork off the top of the bottle, propelling the bottle into the air like a rocket.

Note: Be sure to use caution and keep a safe distance when launching the bottle rocket. Make sure that the rocket is aimed away from people, animals, and any fragile objects.

Free Bottle Rocket Fin Templates

Download my free bottle rocket fin templates to transform your plastic water bottle into a flight-worthy vehicle!

FREE Rocket Fin Templates

Alka-Seltzer Rocket Science Lab Videos

Want to see the water bottle rockets in action? Watch as my kids, their friends, and I propel plastic bottles into the air in the following videos:

• Launching Alka-Seltzer-Powered Rockets with Friends
• Backyard Water Bottle Rocket
• Bottle Rocket Bloopers

Encourage Critical Thinking with the Alka-Seltzer Science Lab

Once students have successfully launched the water bottle rockets, ask them the following questions to encourage them to think critically about the science experiment and retest their designs:

• How would the addition of another Alka-Seltzer tablet affect the launch of the rocket?
• How would doubling the water volume affect the launch of the rocket?
• How would grinding the Alka-Seltzer tablet into a powder affect the launch of the rocket?

Investigating these questions will help students understand the connection between the concentration of reactants, the effect weight has on the height of the rocket launch, and how the surface area of the tablet affects the rate of reaction.

More Ways to Reuse Plastic Water Bottles for Science Experiments

Want more science activities that reuse plastic water bottles? Try one of these:

• How to Make a Cartesian Diver: A Boyle’s Law Science Experiment
• Easy Banana Water Landfill Emissions Science Experiment

• 0.5 L (~16 oz) single-use plastic water bottle
• Optional: fins and decorations for your rocket

Instructions

This science experiment is ideally suited for an outdoor environment, or an area with a lot of empty vertical space, like a gymnasium. I recommend launching the water bottle rockets outdoors, as you can avoid the water clean-up that will be created.

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Middle School Chemical Engineering For Girls

Great Activities for Middle School Outreach in Chemical Engineering

The Alka Seltzer Reaction

Introduction & motivation.

Chemical reactions are one of the primary focuses for Chemical Engineers. From synthesizing polymers to treating water to creating fertilizers, chemical reactions are important in nearly every aspect of daily life. One job of Chemical Engineers is to classify, understand, and control these reactions to speed them up or slow them down.

Chemical reactions occur when bonds within molecules are broken or formed. There are several things that signify that a chemical reaction took place. These include a change in color, the production of a gas or solid, and of course a change in chemical composition. The starting chemicals before a reaction are called the reactants , and the chemicals that are produced are called the products . The reaction in this activity involves using sodium bicarbonate and citric acid to produce water and carbon dioxide.

Reaction : HCO 3 – (aq) + H + (aq) → H 2 O (l) + CO 2 (g)

The tablets contain sodium bicarbonate (NaHCO 3 ) and citric acid. When the tablet is dissolved in water, bicarbonate (HCO 3 – ) and hydrogen ions (H + ) are formed. Once in solution, the two chemicals can then react according to the reaction listed above. For the reaction to occur, the HCO 3 – and H + must collide at the right angle with the right amount of energy. The chances of this happening are better when the tablet is crushed into more pieces since the molecules have more opportunities to collide and when the temperature is higher, since the molecules are moving faster.

In this activity, students will experiment with the reaction between Alka Seltzer tablets and water in different conditions. By changing temperature and the surface area available for reaction, students will begin to see what factors chemical engineers can control to get the desired result.

This activity introduces the reaction used for the Alka Seltzer Rockets activity, so it is typically performed before building rockets to understand the nature of the reaction before using it.

Chemical Safety:

• Sodium Bicarbonate
• Alka Seltzer tablets
• Large beakers
• Food coloring
• Stopwatches
• Metal spoons
• Thermometers

Before the experiment, ask students to hypothesize what will make the reaction go the fastest and what makes them think that. This can be anything, but try to seek answers with specific regard to the variables being changed in this activity.

The Effect of Temperature on Rate of Reaction

• Partially fill a large beaker with ice cubes. Fill the beaker with water up to the 250 mL mark with cold water and stir the ice water until the temperature equilibrates.
• Measure the temperature of the water and record it in the table.
• Add a tablet and record the time it takes for the tablet to react.
• Repeat 1-2 with room temperature water, then with hot water heated to 70 degrees C using a hot plate.

The Effect of Surface Area on Rate of Reaction

• A whole tablet
• A tablet broken into quarters
• A tablet ground into powder: Place the tablet it a piece of weighing paper (wax or parchment paper work as well) and break it either with your hands or crush it using the back of a metal spoon.
• Add 250 mL of water to a large beaker.
• Measure and record the temperature of the water and make sure it is consistent between trials.
• One student should be ready with a stopwatch and another student should be ready with the whole tablet. The student with the stopwatch should count to three and on three start the stopwatch. At the same time, the other student should drop the tablet into the water.
• Gently stir the water at a consistent speed and pattern.
• As soon as the last of the tablet disappears, yell “Stop!,” stop the stopwatch, and record the time in the table.
• Repeat Steps 2-6 with the quartered tablet and the crushed tablet.

At the end, collect and present all class data on the board. Highlight discrepancies and the general trend.

• Which combination of factors made the reaction go the fastest? The slowest? (Higher surface area and temperature make the reaction go faster. Since the reaction occurs on the surface of the tablet pieces, more access to it will make the reaction go faster because there are more molecules to make bumping together more likely. Higher temperature gives more energy to the molecules, meaning they are more likely to have enough energy for the reaction to continue. The opposite is true for the slowest rate – low surface area and temperature.)
• Why would we want reactions to happen faster or slower? (e.g. we want rusting reactions to be slower to protect metal products, but we want redox reactions that recharge our phone batteries to be fast.)
• Is there a limit to how fast we can make the reaction? Would we want to place a limit if there is not a physical one? (Reactions have maximum rates for a few reasons, like the amount of surface area available to react, if the mixture makes it difficult for molecules to move, etc. If the rate were increased too high, it becomes a safety concern! Sometimes reactions get too fast, too hot, and can’t be slowed down. This is a dangerous runaway reaction , the last thing a chemical engineer wants!)
• Why did any discrepancies come up in the data? What ways could we make our process better to limit those from affecting the class data as a whole? (Discrepancies come up from human error with measuring time, not having precise sizes of tablets, imprecise temperature control across trials, and how hard it is to see a reaction is finished! Let students get creative with suggesting improvements, but a few could include using a grid and knives to chop up tablets or putting the ground tablets through a sieve, using a robot to stir and observe the reaction, and putting the beakers in water baths.)
• We know Alka Seltzer is a medicine to make us feel better. Why might it be designed to fizz? (Fizzing helps the aspirin in the tablet quickly absorb into the bloodstream, making the medicine fast-acting. It might also make it more appetizing to drink!)

Additional Resources

• How Does Alka Seltzer Work?
• VIDEO: Why Does Alka Seltzer Fizz?
• ← Alka Seltzer Rockets
• Separations Activity →

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Blow up a balloon with Alka Seltzer – valentine style

January 19, 2016 By Emma Vanstone 2 Comments

This fun Valentine’s Day themed science experiment is a fun twist on the traditional blowing up a balloon with alka seltzer activity.

The idea is that you add something that produces gas to a bottle with a balloon on top. The gas first fills the bottle and then the balloon, blowing it up.

It’s a great way to demonstrate how gases spread out to fill all the available space!

I used an Alka Seltzer, but effervescent vitamin tablets also work really well.

How to blow up a balloon with alka seltzer

What you need

Small bottle

Alka seltzer

Felt tip pen/sharpie

Blow up the balloon first and then let the air out, and draw a small heart on the balloon.

Fill the bottles or jars with water, leaving a gap at the top.

Drop the Alka Seltzer into the bottle and quickly place the balloon on the top.

Watch as the balloon blows up and your heart grows.

Extension tasks

Can you think of anything else you could use instead of Alka Seltzer? We tried to blow up a balloon with popping candy with some interesting results, but baking soda and vinegar would be another good investigation.

Why does the balloon blow up?

Alka Seltzer contains sodium bicarbonate ( baking soda ) and citric acid. When you drop a tablet into water, it forms sodium citrate, water and carbon dioxide, which are the bubbles of gas you see. The bicarbonate of soda reacts with the citric acid, this is an acid–base reaction just like we see when we add vinegar to baking soda.

Acid-Base Reactions

 If you place an  acid and a  base  together, they react to neutralise each other, producing a salt. The H(+) cation of the  acid  combines with the OH(-) anion of the base to form water.

More experiments using alka seltzer

Make a fizzy lava lamp . These are great as they can be used over and over again.

A  film canister rocket is a brilliant science activity. They fly up with a lot of force, so remember to stand back!

Last Updated on February 1, 2024 by Emma Vanstone

Safety Notice

Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

Reader Interactions

January 27, 2016 at 8:36 pm

What a fun activity , I think I will try this out with my daughter as she will be amazed. Thank you for the idea x

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Science Fun

Easy Film Canister Rocket

• Plastic film canister with lid
• Alka-Seltzer tablet
• Tray or flat bottom container
• Safety Glasses

Instructions:

• Fill the film canister about one-third of the way full with water.
• Make sure you are wearing your safety glasses.
• Break one Alka-Seltzer tablet in half. 
• Drop the half of the Alka-Seltzer tablet in the water and quickly put the lid on the film canister.
• While still moving quickly, flip your Film Canister Rocket over and set it on its lid in the tray.
• Step away and watch.
• Your Film Canister Rocket should launch in a few seconds. 

WATCH THE QUICK AND EASY VIDEO TUTORIAL

How it Works:

The water dissolves the Alka-Seltzer tablet causing carbon dioxide gas to be released. The gas creates pressure in the film canister and will eventually create enough pressure that your Film Canister Rocket will launch.  

Make This A Science Project:

Try different amounts of Alka-Selzer to see if it causes the Film Canister Rocket to launch higher or quicker. Try different liquids other than water. Try hot and cold water. 

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Snow Storm in a Jar | Weather Science for Kids

We are loving exploring weather science for kids , and this Snow Storm in a Jar has to be one of the coolest we’ve tried yet!

This Snow Storm in a Jar is a super safe and easy science experiment for preschoolers or elementary-aged children.

It’s a great science experiment to try if you’re stuck in the house from a snow storm – or, it’s been awhile since you’ve seen some snow.

And even better, this jar can be reused for weeks on end! Our jar still erupts into a snow storm whenever we pull it out – and it’s been three weeks since we made it. (I’ll update this post when I know how long it will actually last for.)

How To Make Your Own Snow Storm in a Jar

Gather your materials:

• White paint
• Alka Seltzer

I used one cup of baby oil and 1/4 cup of water, but you’re going to want to adjust your liquids based on the size of your container.

Mix enough paint with your water to get a thick, saturated colour and stir it to ensure that the paint is evenly dispersed throughout. You REALLY want to be able to notice the water when it “storms” into the baby oil.

Layer the white water on the bottom and then add the baby oil gently overtop. Add as much glitter as you can handle. (Considering my blog is called Sugar, Spice & Glitter – we definitely didn’t go light on the glitter!)

And as a special Lemon Lime twist (since we’re on Lemon Lime Adventures after all) we used Lemon Lime Alka Seltzers to create our snow storms.

Drop the whole Alka Seltzer into the jar to start your snow storm! It’s might be a bit hard to see in the pictures, but the Alka Seltzer sends the water cascading up in waves and bubbles, with the baby oil slowing everything down so you can observe the storm in slow motion.

And just in case you were apprehensive about adding in the glitter, look how shimmery and magical it makes the the “snow” look!

This winter science experiment  is a unique way to explore the the immiscibility of water and oil; they are un-mixable because the force of attraction between the individual liquids (oil and oil, water and water) is greater than the force of attraction between oil and water.

Also, the density of the two liquids comes into play. The oil is less dense than the water, so it sits on top and exerts pressure downwards onto the water. The Alka Seltzer creates force pushing the water up, but the oil is constantly exerting pressure on it.

And another dimension to this science experiment is the reaction of sodium bicarbonate (baking soda) with citric acid when mixed with water to form bubbles of carbon dioxide gas. (This is the same chemical reaction observed in our homemade bath bombs .)

That’s a lot of science in one jar!

• forces of attraction
• solubility/immiscibility
• density (check out our density jar experiment for another way to explore this concept)
• chemical reactions

Would your kids enjoy making their own snow storm in a jar?

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Super Cool Lava Lamp Experiment for Kids

This lava lamp experiment is super cool! Your kids will love exploring colored water and oil, but a surprise ingredient will make this science activity even more exciting!

It’s always a hit with the kids. So grab a few household supplies and give this lava lamp science activity a try!

Lava Lamp Science Experiment

As part of our science lessons this school year, we are trying out all kinds of really neat science experiments and activities. This lava lamp experiment tops the list!

*Disclaimer: Adult supervision is required for this experiment. You must supervise your children at all times while doing it.  Do not allow children to put any of the items in their mouth and do not do this experiment if your children still put things in their mouth.

Both of my kids had a blast with this. We’ve actually done it several times and with all different colors, but it never ceases to amaze them. It’s almost shocking how long they will engage with it.

One great thing about this science experiment is that you only need a few supplies and your probably already have most of them in your home or classroom.

Lava Lamp Experiment

Supplies Needed:

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• Vegetable Oil
• Food coloring – primary colors or neon
• Original Alka Seltzer tablets

To begin, color about 1/2 cup of water with food coloring. I like using these gel food colors for vibrant coloring.

Take the Alka Seltzer tablets and break them into 2 or 3 pieces. Place them in a small cup or container.

Fill a glass about 3/4 full with vegetable oil. Then pour in the colored water until the liquid in the cup is about 1-2 inches from the top.

You don’t want it to overflow! Well, unless you want to turn it into an eruption experiment too. For this reason and quick cleanup, I like to do this on a tray.

Add pieces of the Alka Seltzer tablet to the cup. *DO NOT let kids put the tablet in their mouth at any time.

Why this Science Experiment Works

The water and oil do not mix and the oil doesn’t change color because the food coloring is water soluble. The Alka Seltzer reacts with the water to make bubbles of carbon dioxide.

The bubbles attach themselves to the blobs of colored water and bring them to the top of the glass. When the bubbles pop the blobs of colored water fall back to the bottom of the glass.

This lava science experiment is sure to WOW your kids. They may even ask you to do it over and over again like mine did!

Video of Lava Lamp Experiment

Winter Lava Lamp Experiment!

This Blizzard Lava Lamp experiment is super cool! Your kids will love exploring colored water and oil with a winter twist!

Our kids were so excited because it looked like a blizzard was going on inside the glass. They had a blast with this fun science activity!

Benefits of Science Experiments with Kids

Science experiments help foster curiosity, ignite children’s imagination and help nurture a love for learning! It’s a great way for kids to develop fine motor skills, problem solving and analytical thinking while having fun and being creative!

From colorful chemical reactions to mesmerizing physics your kids will have a blast learning.

1. Hands-On Learning

When young kids actively engage in experiments, they grasp complicated concepts more easily. The tactile nature of experiments allows them to visualize abstract ideas, fostering comprehension that traditional teaching methods might struggle to achieve.

2. Cultivating Critical Thinking

Through engaging in science experiments, children refine their skills in observing, analyzing, and incorporating new information.

3. Fostering Creativity

Science experiments often involve a degree of unpredictability. When children witness unexpected outcomes, they are prompted to think creatively and to experiment with new strategies. This nurtures an environment of innovation, where they learn that failure is not a setback, but rather an opportunity to learn!

4. Building Confidence and Self-Esteem

As kids conduct experiments and have successful results, their confidence grows. This newfound confidence will have a positive ripple effect, encouraging them to tackle new challenges with enthusiasm and perseverance.

5. Real-Life Application

Science experiments bring scientific theories to life, showcasing how the principles are applied in real-world situations.

6. Improved Fine Motor Skills

Engagement in science experiments is a fun way for kids to work on fine motor skills. They will be accomplishing a variety of tasks using their hands, while learning and having a great time.

7. Bonding and Collaborative Learning

Science experiments can become wonderful bonding experiences for families, friends, and classmates. Whether it’s a family project or a group activity in the classroom, kids will develop connections and create great memories.

Science experiments offer amazing benefits for kids while being fun and engaging!

Other Fun Science Experiments

Grow a Rainbow  with this fun science experiment! This is quick to setup and you just need markers, a paper towel and two cups of water!

Try this super simple  Oobleck recipe  that only requires two household ingredients!

If your kids love this oobleck activity, they will absolutely love the  Dinosaur Dig Excavation  activity!

This rainbow  Walking Water Science Experiment  is one of our most popular science activities!

This  rain cloud jar science experiment  gives children a chance to explore clouds and rain in a fun and engaging way.

Explore chromatography with this fun  chromatography science experiment  for kids!