The chemical formula for calcium carbonate is CaCO3. It is made up of one atom of carbon as well as the carbonate ion (CO32-), a common polyatomic ion.

Calcium carbonate is a very abundance substance. It’s used in a variety of industries. It’s often a part of dietary aids (as a calcium supplement or in over-the-counter antacids.) Upon reaction with acids, CaCO3 releases CO2.