When you add sodium hydrogen carbonate to acetic acid in a test tube, a gas liberates immediately with brisk effervescence. Name this gas. Describe the method of testing this gas.

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Solution

When acetic acid reacts with sodium hydrogen carbonate, $C O_{2}$ is released with brisk effervescence.

The presence of $C O_{2}$ can be checked by passing the gas through lime water which turns milky on reacting with $C O_{2}$ thus indicating its presence.

$N a H C O_{3} + C H_{3} C O O H \to C H_{3} C O O N a + H_{2} O + C O_{2}$

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Similar questions

A student takes 2 mL acetic acid in a dry test tube and adds a pinch of sodium hydrogen carbonate to it. He makes the following observations

I. A colorless and odourless gas evolves with a brisk effervescence.

II. The gas turns lime water milky when passed through it.

III. The gas burns with an explosion when a burning splinter is brought near it.

The gas extinguishes the burning splinter that is brought near it.

The correct observations are

(a) What happens when dilute hydrochloric acid is added to sodium carbonate ? Write a balanced chemical equation of the reaction involved.

(b) Which gas is liberated when dilute hydrochloric acid reacts with sodium carbonate ? How will you test for the presence of this gas ?

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