Question

A salt X is formed and a gas is evolved when ethanoic acid reacts with sodium hydrogen carbonate. Name the salt X and the gas evolved. Describe an activity and draw the diagram of the apparatus to prove that the evolved gas is the one which you have named. Also, write a chemical equation of the reaction involved.

Answer 1

Explanation

1. The evolved gas is Carbon dioxide $\left({\mathrm{CO}}_2\right)$, while salt "X" is Sodium ethanoate $\left({\mathrm{CH}}_3\mathrm{COONa}\right).$
2. When sodium hydrogen carbonate and ethanoic acid combine, sodium ethanoate is created along with carbon dioxide gas.
3. ${\mathrm{CH}}_3\mathrm{COOH}+{\mathrm{NaHCO}}_3\to {\mathrm{CH}}_3\mathrm{COONa}+{\mathrm{H}}_2\mathrm{O}+{\mathrm{CO}}_2$

Acitvity:

1. 
2. Construct the experiment as depicted in the illustration.
3. Ethanoic acid $\left({\mathrm{CH}}_3\mathrm{COOH}\right)$ should be placed in a test tube.
4. To the acid, add Sodium bicarbonate $\left({\mathrm{NaHCO}}_3\right)$.
5. Place a cork over the test tube's mouth to seal it, then join a delivery tube to it.
6. Put lime water in a different test tube and connect it to the delivery tube's other end.
7. The lime water will change to a milky colour, as you can see.
8. This demonstrates that Carbon dioxide $\left({\mathrm{CO}}_2\right)$ is the evolved gas.