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    Home » Primary Science » Key Stage 1 Science » Scientific Enquiry » Blow up a balloon with alka seltzer

    Blow up a balloon with alka seltzer

    May 4, 2015 By Emma Vanstone 1 Comment

    This is a great, fun way to introduce chemical reactions to children. Even if they’re too young to understand the chemistry behind the reactions themselves, just the idea that a substance can change when another is added is a really useful concept to start to grasp.

    We tested alka seltzer and popping candy to see which was the best at blowing up a balloon. You could also try baking soda and vinegar.

    Blow up a balloon with alka seltzer

    What you need

    Small bottle

    Alka seltzer

    Popping candy

    Water

    Balloons

    DSC_0017

    Method

    Blow up the balloons first and then let the air out. We found this made them blow up a bit faster during the activity.

    Fill the small bottles or jars with water, I left a small gap at the top.

    Add the alka seltzer to one bottle and popping candy to another before quickly placing the balloons on top.

    Watch as the balloons blow up.

    blow up a balloon with popping candy

    Which is the biggest? Why do you think this is?

    Why does this happen?

    Popping candy is made by heating the ingredients and then exposing to Carbon Dioxide ( a gas ) at very high pressures before allowing to cool. Tiny bubbles of gas are trapped in the popping candy. When popping candy is added to water it breaks down and releases the carbon dioxide which then fills the available space in the jar and the balloon.

    Alka Seltzer contains contain  sodium bicarbonate ( baking soda ) and citric acid. When you drop a tablet into water it forms sodium citrate, water and carbon dioxide which is 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.

    Extension tasks

    What happens if you use warmer water in the jars? Does the balloon blow up faster?

    What else could you try?

    How about baking soda and vinegar?

    Make a film canister rocket

    Now you’ve seen just how much gas is released from an alka seltzer, use one to make a film canister rocket. The rocket blasts off because the gas released builds up behind the canister lid, eventually reaching high enough pressure that the tops blows off!

    Blow up a balloon with alka Seltzer

    Last Updated on August 26, 2022 by Emma Vanstone

    « X is for Bottle Xylophone
    How to speed up a chemical reaction »

    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

    Comments

    1. jeannine @ waddleeahchaa

      May 05, 2015 at 8:27 pm

      My kiddos love these types of experiments. We have the book Naked Eggs by Steve Spangler and the kids always have a blast with his hands-on science experiments.

      Reply

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