# Define the term brisk effervescence?

Brisk effervescence is defined as the rapid or vigorous evolution of a gas in a chemical reaction. It is evidence that in the reaction carbon dioxide is liberated.

### Example

When sodium bicarbonate is added to acetic acid brisk effervescence is produced. The reaction is given below:

CH3COOH + NaHCO3→ CH3COONa + CO2+ H2O