Question

Write the chemical formula of plaster of paris

Answer 1

CaSO4.1/2H2O is the formula

Answer 2

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• CHEMICAL FORMULA OF PLASTER OF PARIS : CaSO4.1/2H2O .

( Calcium sulphate hemihydrate )

⇒ Obtained by heating gypsum at 120°C .

⇒ White powder.

⇒ Sets into hard mass on adding water.

⇒ Losses water of crystallization at 473K.

⇒ Used for plastering fractured bones.

⇒ Used for making toys , decorative materials.

⇒ Used for casts for statues, toys, surgical instruments.

⇒ Used for blackboard chalk.

CHEMICAL REACTION/EQUATION :

• CaSO₄.1/2H₂O + 1 1/2 H₂O  -------------> CaSO₄.2H₂O

       ( PLASTER OF PARIS )                           ( GYPSUM )