What is gypsum? What happens when gypsum is heated to 120°C?

Gypsum is hydrated calcium sulphate, CaSO₄ · 2H₂O. On heating to 120°C, it loses part of its water of crystallisation and forms a white powder known as plaster of Paris.

2 {CaSO}_{4} . 2 H_{2} O \overset{120^{ο} C}{\to} ({CaSO}_{4})_{2} . H_{2} O + 3 H_{2} O (g)

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