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Chemistry
Permanent hardness of water can be removed by which of the following process?
Q. Permanent hardness of water can be removed by which of the following process?
2033
215
NTA Abhyas
NTA Abhyas 2020
The s-Block Elements
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A
Sodiumbicarbonate
0%
B
Sodium chloride
0%
C
Washing soda
100%
D
Sodalime
0%
Solution:
Washing soda removes both the temporary and permanent hardness by converting soluble calcium and magnesium compounds into insoluble 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
→
C
a
C
O
3
+
N
a
2
S
O
4
C
a
(
H
C
O
3
)
2
+
N
a
2
C
O
3
→
C
a
C
O
3
+
2
N
a
H
C
O
3