Answer 1

Hydrochloric acid reacts with sodium carbonate to give sodium chloride with the release of CO₂ gas.

\[\ce{\underset{\text{Sodium carbonate}}{Na2CO3} + \underset{\text{Hydrochloric acid}}{2HCl} -> \underset{\text{Sodium chloride}}{2NaCl} + \underset{\text{Water}}{H2O} + \underset{\text{Carbon dioxide}}{CO2}}\]