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A compound X ...

Question

A compound X which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water.
(a) Identify the compound X
(b) Write the chemical equation for its preparation
(c) For what purpose is it used in hospitals?

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Solution

a) Compound X is plaster of Paris, or calcium sulphate half hydrate (CaSO₄.1/2H₂O)

b) CaSO₄.2H₂O → CaSO₄.1/2H₂O + 3/2 H₂O

c) Plaster of Paris is used in hospitals for setting fractured bones in the right position to ensure correct healing. Casts made of plaster of Paris help keep the fractured bone straight.

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