Question

Explain about plaster of Paris.

Answer 1

Answer: plaster of Paris is mainly a compound of calcium sulphate hemihydrate.caso4.1/2 H2o

Explanation:it is used for plastering fractured bones and making toys and materials for decoration.

Answer 2

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Plaster of Paris is also called calcium sulphate hemihydrate.

Formula:- CaSO4.1/4H2O.

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Plaster of Paris is prepared by heating gypsum(CaSO4.2H2O) to a temperature of 100°C in a kiln. When gypsum is heated to a temperature of 100°C, it loses three-fourths of its water of crystallisation and forms Plaster of Paris :

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

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➡️It is a white powder.

➡️It has a very remarkable property of setting into a hard mass on wetting with water.

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➡️It is used in making toys.

➡️It is used in making decorative materials, casts for statues etc.

➡️It is used as a fire proofing material.

➡️It is used in hospitals for setting fractured bones in right positions.

➡️It is used in chemistry laboratories for sealing air gaps in apparatus.