Question

How is plaster of paris prepared?How does it react with water?Give reation?

Answer 1

When it is mixed with water, crystals of gypsum(CaSO4.2H2O ) are produced and set into hard mass. Plaster of paris is prepared by heating calcium sulfate dihydrate, or gypsum, to 120–180 °C (248–356 °F). ... When water is added to the plaster of Paris powder it rehydrates (absorbs water) and quickly hardens.

Answer 2

hey dear..

Here is your answer

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=> Plaster of Paris is prepared by gypsum...

Gypsum is calcium sulphate dihydrate...

CaSO4.2H2O ------------> CaSO4.½H2O + 1½H2O

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Reaction with water..

=> CaSO4.½H2O + 1½H2O -----------> CaSO4.2H2O

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Hope it's helpful...

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