General Science • ChemistryEasy
What is the chemical formula of the compound commonly known as 'plaster of Paris'?
A. CaSO4·2H2O
B. CaSO4·1/2H2O✓ Correct Answer
C. CaCO3
D. CaOCl2
💡 Solution & Explanation
Plaster of Paris is chemically known as calcium sulfate hemihydrate, represented by the formula CaSO4·1/2H2O, and is produced by heating gypsum to a specific temperature. The formula CaSO4·2H2O represents gypsum, which is the dihydrate form before the removal of water molecules of crystallization. This compound sets into a hard mass upon mixing with water, making it widely used for medical casts and decorative molding.
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