Question

What would you observe on adding dilute hydrochloric acid to
(i) sodium bicarbonate placed in a test tube?
(ii) zinc metal in a test tube?

Answer 1

(i) Carbon dioxide gas will evolve accompanied by brisk effervescene.

${\text{NaHCO}}_3\text{(s)}+\text{HCl(aq)}\to \text{NaCl(aq)}+{\text{CO}}_2\text{(g)}+{\text{H}}_2\text{O(aq)}$

(ii) Hydrogen gas will evolve accompanied by brisk effervescene.

$\text{Zn(s)}+2\text{HCl(aq)}\to {\text{ZnCl}}_2\text{(aq)}+{\text{H}}_2\text{(g)}$