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Standard X
Chemistry
Plaster of Paris
What is obtai...
Question
What is obtained when gypsum is heated at
373
K
?
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Solution
Gypsum:
Gypsum is the common name for calcium sulfate dihydrate having the chemical formula,
CaSO
4
.
2
H
2
O
.
Chemical Reaction:
Heating gypsum at
373
K
results in loss of water of crystallization, forming plaster of Paris
(
CaSO
4
.
1
2
H
2
O
)
as the product.
The chemical reaction is as follows,
CaSO
4
.
2
H
2
O
→
CaSO
4
·
1
2
H
2
O
+
3
2
H
2
O
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Q.
(a) What is gypsum? What happens when gypsum is heated to 100°C (373 K)?
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