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JEE Main 8 Apr 2019 Paper 1 Solved Paper
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Question : 38
Total: 91
100 mL of a water sample contains 0.81 g of calcium bicarbonate and 0.73 g of magnesium bicarbonate. The hardness of this water sample expressed in terms of equivalents of
C
a
C
O
3
is: (molar mass of calcium bicarbonate is 162 g mol
−
1
and magnesium bicarbonate is 146 g mol
−
1
)
1,000ppm
100 ppm
10,000 ppm
5,000 ppm
Validate
Solution:
162
g
of
C
a
(
H
C
O
3
)
2
≡
100
g
C
a
C
O
3
100 ml sample contain 0.81g of
C
a
(
H
C
O
3
)
i.e., equal to 5g of
C
a
C
O
3
/lit and 0.73 g of
M
g
(
H
C
O
3
)
2
per 100ml is equal to 5g of
C
a
C
O
3
per lit. total hardness is10g per litre or 10,000 ppm
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