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Inflating a Balloon Hands-Free ~ Science Sunday

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Science Sunday

This experiment was so simple, it seems almost silly to post it. It seriously took me longer to round up a soda bottle to use for the experiment than it did to run the experiment. All that said, the kids absolutely loved it and we extended it a little bit by talking about the periodic table and elements.

Question of the Week…What would happen to a balloon with baking soda inside when placed on top of a soda bottle that had vinegar in it?

Items we used for this experiment:

~ soda bottle

~ one balloon

~ 2 Tbsp. baking soda

~ 8 Tbsp. vinegar

~ funnel & measuring spoon

Predictions and Experiment…

Each of the kids made a prediction about what they thought would happen ~ an explosion and mess, nothing, inflation, etc….

Zachary and Laurianna worked together measuring the baking soda and putting it into the balloon using a funnel.


We added the vinegar into the soda bottle {after rinsing out our funnel} and then stretched the base of the balloon over the opening of the soda bottle, being careful not to drop any of the baking soda into the bottle.

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We then tipped the balloon up and let the baking soda fall into the bottle and the balloon quickly began to inflate.


Fun, no?

The Nutshell Reason…

If you want the really technical reason, here is why…


The reason really is simple though. The vinegar and the baking soda mix, forming a chemical reaction and creating a gas {carbon dioxide} that fills the balloon.


How to Do Science Experiments with Children Resource: How to Do Science Experiments with Children is available from Amazon and you can also check it out {and do some of the experiments} using Google Docs! The experiments use easy-to-find objects and also include record sheets for kids to fill out with their predictions and experiment results. Each experiment also includes teaching tips and explanations…which are rather handy! :)

Don’t forget to check out some other great science ideas at Science Sunday hosted by Ticia at Adventures in Mommydom.

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This post may contain affiliate or advertiser links. Read my full disclosure policy .

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