Why don't we directly use gypsum …

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Why don't we directly use gypsum for moulding instead of converting it into plaster of Paris and then using it for moulding?

Posted by Divija Bansal 5 years, 4 months ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 5 years, 2 months ago

Plaster of paris is calcium sulphate hemihydrates. Its chemical formula is: CaSO4. ½H₂O.

It is prepared by heating gypsum to a temperature of 100°C in a kiln; it loses ¾ of its water of crystallisation and forms plaster of paris.

Uses of Plaster of paris:

(i) It is used as a fire proofing material.

(ii) It is used in hospitals for setting fractured bones in the right position to ensure correct healing.

Gypsum is calcium sulphate dihydrate. When gypsum is heated to a temperature of 100 °C, it loses ¾ of its water of crystallisation and forms plaster of paris.

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CBSE > Class 10 > Science