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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
2029
188
AFMC
AFMC 2010
Hydrogen
Report Error
A
N
a
2
C
O
3
73%
B
K
8%
C
C
a
(
OCl
)
Cl
8%
D
C
l
2
12%
Solution:
Washing soda,
(
N
a
2
C
O
3
⋅
10
H
2
O
)
is used to remove permanent hardness of water. It converts
C
a
2
+
and
M
g
2
+
salts (soluble) to carbonates (insoluble).
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
M
g
C
l
2
+
N
a
2
C
O
3
→
M
g
C
O
3
↓
+
2
N
a
Cl