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.

NaHCO3(aq) + H C2H3O2(aq)NaC2H3O2(aq) + H2O(l) + CO2(g)

How can I do it at home?

An adult must be present. 

  1. Put a small amount of baking soda into a glass
  2. Pour a small amount of vinegar into the glass
  3. Watch the fun!

What would happen if...

  • you try adding more or less vinegar?
  • you try adding more or less baking soda?
  • you try adding warm vinegar or cold vinegar?

still have questions?  email us!

explanation furnished by UCCS's Dr. David Anderson



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