Question

9. When water is mixed with Plaster of Paris (POP) and allowed to dry, it sets into a hard mass
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Answer 1

Qᴜᴇꜱᴛɪᴏɴ :

➻ When water is mixed with Plaster of Paris (POP) and allowed to dry, it sets into a hard mass

ᴀɴꜱᴡᴇʀ :

➛ On mixing with water, plaster of paris takes up water of crystallization to form orthorhombic calcium sulphate dihydrate. This sets to a hard mass which is monoclinic calcium sulphate dihydrate or gypsum. This is the final product of setting of plaster of paris. Its composition is CaSO4⋅2H2O.

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