Calcium Carbonate , CaCO3 Calcium carbonate is also called limestone. It occurs in nature as Chalk, marbles, corals, calcite. Mixed with magnesium carbonate it occurs as dolomite. Preparation of Calcium Carbonate 1) From slaked lime It can be prepared by passing a calculated quantity of CO2 through slaked lime. Ca(OH)2+ CO2 ------> CaCO3 ↓ + H2O 2) From calcium … [Read more...] about Calcium Carbonate