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Standard XII
Chemistry
Hardness of Water and Treatment
Question
Calgon removes hardness by forming complex compounds with the
C
a
2
+
and
M
g
2
+
ions of hard water or by adsorption.
True
False
A
True
B
False
Open in App
Solution
Verified by Toppr
Calgon is
(
N
a
6
P
6
O
18
)
i.e. sodium hexa-metaphosphate. The calgon when added to hard water forms a soluble complex.
N
a
2
[
N
a
4
(
P
O
3
)
6
]
+
2
C
a
S
O
4
⟶
2
N
a
2
S
O
4
+
N
a
2
[
C
a
2
(
P
O
3
)
6
]
soluble
In the same way,
M
g
2
+
can also precipitate as
N
a
2
[
M
g
2
(
P
O
3
)
6
]
and water becomes free from
M
g
2
+
and
C
a
2
+
ions.
Thus the answer is True.
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C
a
2
+
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