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Standard IX
Chemistry
Hardness of Water:Causes, Types and Treatments
Question
Water softening by Clark's process uses:
potash alum
calcium bicarbonate
sodium bicarbonate
calcium hydroxide
A
sodium bicarbonate
B
calcium bicarbonate
C
potash alum
D
calcium hydroxide
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Solution
Verified by Toppr
Water softening by Clarke's process uses calcium hydroxide (lime). It removes temporary hardness.
C
a
(
H
C
O
3
)
2
+
C
a
(
O
H
)
2
→
2
C
a
C
O
3
+
2
H
2
O
.
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