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What is gypsum? What happens when gypsum is heated to 120°C?
Gypsum is hydrated calcium sulphate, CaSO
4
· 2H
2
O. 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
→
120
ο
C
(
CaSO
4
)
2
.
H
2
O
+
3
H
2
O
(
g
)
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