Before revision: CaCO3 + H2SO4 → CaSO4 + H2O + CO2 In this last reaction, calcium carbonate reacts with sulfuric acid and produce calcium sulfate, water and carbon dioxide.
After revision: CaCO3 + H2SO4 → CaSO4 + H2O + CO2 In this last reaction, calcium carbonate reacts with sulfuric acid and produces calcium sulfate, water and carbon dioxide.