A gas is liberated immeiately with a brisk effervescence, when you add acetic acid to sodium hydrogen carbonate power in a test tube. Name the gas and describe the test that confirms the identify of the gas.

Explanation

### Step-by-Step Solution:

1. **Identify the Reaction**: When acetic acid (CH₃COOH) is added to sodium hydrogen carbonate (NaHCO₃), a chemical reaction occurs. This reaction produces sodium acetate, water, and a gas.

2. **Write the Chemical Equation**: The balanced chemical equation for the reaction is:
\[ \text{CH}_3\text{COOH} + \text{NaHCO}_3 \rightarrow \text{CH}_3\text{COONa} + \text{H}_2\text{O} + \text{CO}_2 \uparrow \]
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