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

 $C{{H}_{3}}COOH+NaHC{{O}_{3}}\to C{{H}_{3}}COONa+C{{O}_{2}}+{{H}_{2}}O$ Gas evolved is$C{{O}_{2}}$. It is tested by passing $C{{O}_{2}},$ in lime water which turns milky due to formation of insoluble$CaC{{O}_{3}}$. $Ca{{(OH)}_{2}}+C{{O}_{2}}\xrightarrow[{}]{{}}CaC{{O}_{3}}+{{H}_{2}}O$