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Question

Give the chemical formula of Calcium sulphate hemihydrate


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Solution

Calcium sulphate hemihydrate:

  • Calcium sulphate hemihydrate is one molecule of CaSO4containing 12molecule of water and is also known as Plaster of Paris
  • Its chemical formula can be written as CaSO4.12H2O.
  • Plaster of Paris is a white powder, which when mixed with water sets into a hard mass and is used for fixing broken bones.
  • It is formed by heating gypsum (CaSO4.2H2O) at 373393K or 120°C.

CaSO4·2H2O(s)Gypsum120°CCaSO4·12H2O(s)PlasterofParis+32H2O(g)Water

Therefore, the chemical formula of Calcium sulphate hemihydrate is CaSO4.12H2O.


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