Question

When solid Sodium carbonate is mixed with dilute $\mathrm{HCl}$, __________ gas is produced.

Answer 1

1. When solid Sodium carbonate (${\mathrm{Na}}_2{\mathrm{CO}}_3$) is mixed with dilute $\left(\mathrm{HCl}\right)$ (Hydrochloric acid), then Sodium chloride$\left(\mathrm{NaCl}\right)$, Carbon dioxide $\left({\mathrm{CO}}_2\right)$ and water $\left({\mathrm{H}}_2\mathrm{O}\right)$ are formed.
2. Reaction: $\underset{(\mathrm{Sodium}\mathrm{carbonate})}{\underbrace{{\mathrm{Na}}_2{\mathrm{CO}}_3\left(\mathrm{s}\right)}}+\underset{(\mathrm{dil}.\mathrm{Hydrochloric}\mathrm{acid})}{\underbrace{2\mathrm{HCl}\left(\mathrm{aq}\right)}}\to \underset{(\mathrm{Sodium}\mathrm{chloride})}{\underbrace{2\mathrm{NaCl}\left(\mathrm{aq}\right)}}+\underset{}{\underset{(\mathrm{Carbon}\mathrm{dioxide})}{\underbrace{{\mathrm{CO}}_2\left(\mathrm{g}\right)}}}+\underset{\left(\mathrm{Water}\right)}{\underbrace{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}}$
3. The evolution of Carbon dioxide $\left({\mathrm{CO}}_2\right)$ is confirmed by the lime water test.

Therefore, when solid Sodium carbonate is mixed with dilute $\left(\mathrm{HCl}\right)$, Carbon dioxide (${\mathrm{CO}}_2$) gas is produced.