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Question
Chemistry
Permanent hardness of water can be removed by adding
Q. Permanent hardness of water can be removed by adding
2033
185
Uttarkhand PMT
Uttarkhand PMT 2011
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A
sodium chloride
B
soda lime
C
sodium carbonate
D
sodium sulphate
Solution:
Sodium carbonate removes both the temporary and permanent hardness by converting soluble calcium and magnesium compounds into in soluble carbonates.
C
a
C
l
2
+
N
a
2
C
O
3
→
C
a
C
O
3
+
2
N
a
Cl
C
a
S
O
4
+
N
a
2
C
O
3
→
N
a
2
S
O
4
+
C
a
C
O
3