Question

State what you would observe when: Dilute hydrochloric acid is added to calcium carbonate.

Answer 1

• When dilute hydrochloric acid is added to calcium carbonate, a colourless, odourless gas which turns lime water milky i.e. carbon dioxide gas is evolved.
• $\underset{\mathrm{Calcium}\mathrm{carbonate}}{{\mathrm{CaCO}}_3\left(\mathrm{s}\right)}+\underset{\mathrm{Hydrochloric}\mathrm{acid}}{2\mathrm{HCl}\left(\mathrm{l}\right)}\to \underset{\mathrm{Calcium}\mathrm{chloride}}{{\mathrm{CaCl}}_2\left(\mathrm{s}\right)}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}+\underset{\mathrm{Carbon}\mathrm{dioxide}}{{\mathrm{CO}}_2}\uparrow \left(\mathrm{g}\right)$