Q.

Calculate the degree of hardness (in ppm) of a sample of water containing 6 mg of MgSO4 per kg of water. 

Mol. wt. of MgSO4=120 g mol1

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a

4 ppm

b

5 ppm

c

Insufficient data

d

6 ppm

answer is A.

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Detailed Solution

Degree of hardness=wt. of given saltIts Mol. wt.×108wt.of water(gm) ppm                                              =6×10-3120×108103 = 5 ppm

                                

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