Vinegar and Baking Soda
A balloon with baking soda in it was stretched over the mouth of a flask containing vinegar. The balloon was tipped so that the baking soda fell into the vinegar, and the reaction bubbled and inflated the balloon.
Baking soda is sodium bicarbonate (NaHCO3), a weak base, and vinegar contains acetic acid (HC2H3O2), a weak acid. When mixed, the two react in an acid-base neutralization reaction. One of the products is carbon dioxide gas (CO2), which causes the bubbling and inflates the balloon.
How can I do it at home?
An adult must be present.
What would happen if...
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explanation furnished by UCCS's Dr. David Anderson