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Question

100mL of a water sample contains 0.81g of calcium bicarbonate and 0.73 of magnesium bicarbonate. The hardness of this water sample expressed in terms of equivalents of CaCO3 is:
(molar mass of calcium bicarbonate is 162g mol1 and magnesium bicarbonate is 146gmol1)

A
1000ppm
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B
10,000ppm
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C
100ppm
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D
5,000ppm
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Solution

The correct option is B 10,000ppm
Solution:- (B) 10000ppm
neq.CaCO3=neqCa(HCO3)2+neqMg(HCO3)2
or ,W100×2=0.81162×2+0.73146×2
w=1.0
Hardness=1.0100×106=10000ppm

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