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Question

Ion concentrations obtained for a groundwater sample (having pH=8.10) are given below.

Ion Ca2+ Mg2+ Na+ HCO3 SO24 Cl
Ion concentration (mg/L) 100 6 15 250 45 39
Atomic weight Ca=40 Mg=24 Na=23 H=1
C=12
O=16
S=32
O=16
Cl=35.5

Total hardness (mg/LasCaCO3) present in the above water sample is

A
250
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B
275
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C
205
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D
308
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Solution

The correct option is B 275
Total hardness in water is due to multivalent cations

Total hardness
=[Ca2+]×Equivalent weight of CaCO3Equivalent weight of Ca2++[Mg2+]×Equivalent weight of CaCO3Equivalent weight of Mg2+

=100×5020+6×5012

=275mg/LasCaCO3

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