CaCO3 - Calcium carbonate

What is Calcium carbonate?

Calcium carbonate is a odourless chemical compound. It is water insoluble source of calcium. It is mainly found in rocks and is carbonic salt of calcium. Some of the pure calcium carbonate minerals are Calcite, Vaterite, Aragonite. Biological sources of calcium carbonate are Snail shells, Egg shells, Oyster shells etc. Mostly used as an antacid or calcium supplement. PH value is about 9.91. Its common name is limestone.

Properties of Calcium carbonate CaCO3

Sodium bicarbonate Chemical formula


Molecular Weight/ Molar Mass

100.0869 g/mol


2.71 g/cm³

Boiling Point

Decomposes at 899 °C

Melting Point

825 °C

Calcium carbonate structure CaCO3

Calcium carbonate structure

Calcium carbonate uses

  • It is used as a dietary supplement when the quantity of calcium in the diet is less
  • It is used as an antacid to relieve stomach upset, heartburn
  • It is used in to purify iron from iron ore
  • It is used in the refining of sugar
  • It is used in agriculture to neutralize acidic soil
  • It is used as scrubbing agent in household cleaning powders
  • It is used in the construction of buildings and roads

Learn more about the chemical behavior and importance of Sodium bicarbonate with the expert faculties at BYJU’S.

Practise This Question

In a weird sequence of amnesiac time-travel events, you are transported to 16th century Germany where the only practical fuel (or energy source) is firewood. Suppose you are given a piece of Copper which contains silver in small quantities. As luck would have it, you have a good quantity of Lead at your disposal. In this scenario, which one of the following metallurgical methods would you choose to refine the impure copper?