CBSE Class 10 Science 2017 Delhi Term II Set 1 Paper

Question : 34 of 36

Marks: +1, -0

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

Solution:

{\CH}_3 {\COOH}+ {\NaHCO}_3 → {\CH}_3 {\COONa}+ {\CO}_2+ {\H}_2 {\O}

Gas evolved is

{\CO}_2

. It is tested by passing

{\CO}_2

in lime water which turns milky due to formation of insoluble

{\CaCO}_3

{\Ca}( {\OH})_2+ {\CO}_2 → {\CaCO}_3 ↓+ {\H}_2 {\O}

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