Use a funnel to fill the balloon with baking soda. Put a cup or so of vinegar in the bottle (if your kid is allergic to it like mine is, don't let them help with this part!)
Stretch the balloon over the opening of the bottle and make sure its very secure (rubber band it or even hold onto it if necessary)
Now let the kiddo tip the balloon upright, releasing the baking soda into the bottle. Watch what happens!
Check out the link to our experiment:
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