Question

Name the species that when reacts with hydrochloric acid evolves carbon dioxide gas.

Answer 1

Evolution of carbon dioxide gas:

• When calcium carbonate reacts with hydrochloric acid it leads to the evolution of carbon dioxide and calcium chloride is formed.
• It is a type of acid-base reaction as the calcium carbonate is a base while hydrochloric acid is an acid and salt i.e. calcium chloride is formed.
• This reaction can be called a neutralization reaction.

The reaction of Calcium carbonate $\left({\mathrm{CaCO}}_3\right)$ with $\mathrm{HCl}$:

${\mathrm{CaCO}}_3\left(\mathrm{s}\right)+2\mathrm{HCl}\left(\mathrm{aq}\right)\to {\mathrm{CaCl}}_2\left(\mathrm{aq}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$