Plaster Of
Paris (Short Note)
Definition
The hemi hydrate form of calcium
sulphate is known as Plaster of Paris.
Molecular
Formula
The molecular formula of Plaster of
Paris is
CaSO4. 1/2 H2O
Preparation of Plaster of Paris
When Gypsum (CaSO4.2H2O) is heated to
about 100ºC, it loses some water of crystallization and is converted to Plaster
of Paris.
Uses of Plaster of Paris
1. At high temperatures gypsum loses
all the water of crystallization to give anhydrous calcium sulphate.
2. It is used in manufacture of
H2SO4.
3. It is used in making of cement.
4. It is used in the preparation of
moulds used in surgery and castings.
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