Expanding Balloon Science Experiment

This super-easy expanding balloon science experiment includes balloons and two basic household staples, which is a win-win combination. The bubbly experiment is perfect for all ages, and children can easily help with the activity.

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Supplies to Collect

To perform this fantastic chemistry experiment, gather the following inexpensive supplies:

white vinegar
baking soda
large balloon
water or juice bottle
measuring cup (optional)
measuring spoon
funnel

The Expanding Balloon Science Experiment

In this fizzy science activity, start by stretching a large balloon and blowing a little air into it.

Next, let the air out and place a funnel inside the rolled edge. Spoon in three teaspoons of baking soda. If the bottle you will use is on the larger side, use heaping teaspoons of the powder. Shake the balloon a bit to get the baking soda to the bottom.

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Then pour vinegar into a clean water or juice bottle and fill it about ¼ to 1/3 of the way. Pour the vinegar into a measuring cup first to make this step easier.

Afterward, carefully fit the balloon snugly over the mouth of the bottle. Keep the balloon hanging off the side as you do this.

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Lastly, lift the balloon so the baking soda drops into the bottle and watch the two ingredients bubble and fizz as they react. The balloon will magically self-inflate.

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The Science Behind This Balloon Experiment

Vinegar is a liquid, and baking soda is a solid. In this bubbly, fizzing science experiment, there is a chemical reaction between the vinegar (an acid) and the baking soda (a base). As the two ingredients interact, they release carbon dioxide gas. The gas expands and goes up the balloon, causing it to inflate.

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Variations of the Expanding Balloon Science Experiment

To extend this magical science activity, try using different-sized bottles and varying amounts of vinegar and baking soda to see if the experiment works out just as well.