Question

Sodium hydrogencarbonate when added to acetic acid, produces a gas. Which of the following statement(s) is/are true about the gas evolved?
(i) It turns lime water milky.
(ii) It extinguishes a burning splinter.
(iii) It has a pungent odour.

• A. All (i), (ii), and (iii)
• B. (i) and (ii)
• C. Only (i)
• D. Only (iii)

Answer 1

The correct option is B (i) and (ii)

• When sodium hydrogencarbonate is added to acetic acid, carbon dioxide $\left({\text{CO}}_2\right)$ gas is evolved.

$\underset{\text{Sodium hydrogen carbonate}}{{\text{NaHCO}}_3\left(aq\right)}+\underset{\text{Acetic acid}}{{\text{CH}}_3\text{COOH}\left(aq\right)}⟶\underset{\text{Sodium acetate}}{{\text{CH}}_3\text{COONa(aq)}}+{\text{CO}}_2\left(g\right)+{\text{H}}_2\text{O(l)}$

• ${\text{CO}}_2$ gas turns lime water milky. It extinguishes a burning splinter and is odourless in nature.