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Class 11
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Chemistry
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Hydrogen
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Structure and Properties of Water
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Removal of Temporary Hardness of Water
Removal of Temporary Hardness of Water
5 Mins
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REVISE WITH CONCEPTS
Hard and Soft Water-Advanced
Example
Definitions
Formulaes
>
Important Questions
Calculate the temporary and permanent hardness of water sample having the following the following constituents per litre:
C
a
(
H
C
O
3
)
2
=
1
6
2
m
g
,
M
g
C
l
2
=
9
5
=
m
g
,
N
a
C
l
=
5
8
5
m
g
,
M
g
(
H
C
O
3
)
2
=
7
3
m
g
,
C
a
S
O
4
=
1
3
6
m
g
Medium
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>
What causes the temporary and permanent hardness of water ?
Medium
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>
Pressure cooker reduces cooking time because:
Medium
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>
Write chemical reactions to show the amphoteric nature of water.
Medium
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>
Permanent hardness can be removed by simple boiling it.
Easy
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>
Which of the following methods is used for the removal of temporary hardness of water?
Hard
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>
The hardness of a water sample containing
1
0
−
3
M
M
g
S
O
4
expressed as
C
a
C
O
3
equivalents (in ppm) is ________.
[molar mass of
M
g
S
O
4
is
1
2
0
.
3
7
g/mol]
Hard
JEE Mains
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>
The formula of calgon is:
Medium
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>
State the disadvantages of using hard water.
Hard
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>
One litre of a samle of hard water contains 1 mg of
C
a
C
l
2
and 1 mg of
M
g
C
l
2
.Then the total hardness in terms of parts of
C
a
C
O
3
per
1
0
8
parts of water by mass is:
Medium
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>