Answer :

Salt X is sodium ethanoate and the evolved gas is carbon dioxide.

Procedure: Take a test tube and a bent tube. Take ethanoic acid or acetic acid (HC2H3O2) and sodium hydrogen carbonate or sodium bicarbonate (NaHCO3) solution in the test tube. Insert the bent tube in the cork and fit the cork at the mouth of the test tube. Fill lime water in the bent tube so that lime water is in the ‘U’ portion of this tube.

After some time, it is observed that the lime water turns milky. This confirms that the evolved gas is carbon dioxide (CO2). Carbon dioxide always turns lime water milky.

This reaction can be shown by following equation.

NaHCO3 + HC2H3O2 NaC2H3O2 + H2O + CO2

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