A gas is liberated immediately with a brisk effervescence, ...

CBSE Class 10 Science 2017 Delhi Term II Set 1 Paper

Question : 34

Total: 36

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:

CH3‌COOH+NaHCO3→CH3‌COONa+CO2+H2O

Gas evolved is CO2. It is tested by passing CO2 in lime water which turns milky due to formation of insoluble CaCO3.
Ca(OH)2+CO2→CaCO3↓+H2O

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