Question

(a) When ethanoic acid reacts with sodium hydrogen carbonate, then a salt X is formed and a gas Y is evolved. Name the salt X and gas. Y Describe an activity with the help of a labelled diagram of the apparatus used to prove that the evolved gas is the one which you have named. Also write the chemical equation of the reaction involved.
(b) Give any two uses of ethanoic acid.

Answer 1

a) Ch3cooh + NaHCo3 --------Ch3CooNa + H2O + Co2

Answer 2

Ethanoic Acid is for Medicinal purpose

Explanation:

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 ($HC_2H_3O_2$) and sodium hydrogen carbonate or sodium bicarbonate ($NaHCO_3$) 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 ($CO_2$). Carbon dioxide always turns lime water milky.

The Reaction is shown below:

$NaHCO_3 + HC_2H_3O_2 = NaC_2H_3O_2 + H_2O + CO_2$

Uses of Ethanoic Acid

1. Ethanoic acid is used for making paint, coatings, dyes & additives.
2. It is also used for making medicines like iodine, tincture, and syrups.