What is the observation for baking soda and vinegar blowing up a balloon?

When baking soda (sodium bicarbonate) and vinegar (acetic acid) are mixed, a chemical reaction occurs, producing carbon dioxide gas. This gas causes a balloon to inflate. The chemical reaction is:

NaHCO3 + CH3COOH → CO2 + H2O + CH3COONa

In this reaction, sodium bicarbonate and acetic acid react to form carbon dioxide gas, water, and sodium acetate. The carbon dioxide gas is what causes the balloon to inflate.

This reaction is a classic example of a chemical reaction between an acid and a base. In this case, acetic acid is the acid and sodium bicarbonate is the base. When an acid and a base react, they neutralize each other, producing a salt and water. In this case, the salt is sodium acetate.

The baking soda and vinegar reaction is a simple and safe way to demonstrate a chemical reaction. It is a great way to teach kids about chemistry and to show them how different substances can interact to create new substances.