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Question

One litre of a sample of hard water contains 55.5 mg of CaCl2 and 4.75 mg of MgCl2. The total hardness in terms of ppm of CaCO3 is :

A
5 ppm
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B
10 ppm
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C
20 ppm
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D
none of the above
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Solution

The correct option is B 10 ppm
55.5 g CaCl250 g CaCO3
55.5 mg CaCl250×103 g CaCO3
47.5 g MgCl250 g CaCO3
47.5 mg MgCl250×103 g CaCO3
Total CaCO3=(50+50)×103=102 g/L
Hardness in terms of ppm =1021000×106 mL =10 ppm

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