An acid reacts with metal carbonate produces respectve metal salt, water, and carbon dioxide gas.
[0.5 Marks]
For example, sodium carbonate reacts with hydrochloric acid to produce sodium chloride, water, and carbon dioxide gas.
2HCl(aq)+Na2CO3(s)⟶2NaCl(aq)+H2O(l)+CO2(g)
[0.5 Marks]