Question

Why bubbles are form when vinegar react with baking soda mix?

Answer 1

Vinegar, contains acetic acid CH3COOH dissolved in water. Acetic acid is a weak acid. Baking soda NHCO3 is a base. Neutralization reation occurs when vinegar reacts with backing soda.

NaHCO3 + HC2H3O2 → NaC2H3O2 + H2CO3
The carbonic acid formed by the neutralization is unstable and hence breaks up to give

H2CO3 → H2O + CO2


Carbon dioxide gas being heavier than air, escapes the solution in form of bubbles. Hence you get bubbles when vinegar reacts with carbonic acid.

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Answer 2

Answer:

When baking soda (Sodium hydrogen carbonate) is mixed with lemon juice (citric acid), bubbles are formed. The bubbles are formed due to the evolution of carbon dioxide gas. This is a chemical change.

In this change, citric acid contained in lemon juice reacts with sodium hydrogen carbonate which results in the evolution of carbon dioxide gas.

Lemon juice + Baking soda → Carbon dioxide + Other substances

Citric acid Sodium

Hydrogen carbonate