Calcium carbonate shares the typical properties of other carbonates. Notably:
it reacts with strong acids, releasing carbon dioxide: CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l) it releases...
Carbonic acid destroys calcium carbonate composite shells,corals etc. It happens when carbon dioxide is absorbed in large amounts into water such as the oceans.H2O + Co2 = H2Co3