Question

What is the degree of hardness (PPM) for 1000L water contains 68mg of CaSO4

Answer 1

Degree of hardness is 0.05 PPM

Explanation:

Weight of CaSO₄ = 68 mg

Molecular weight of CaSO₄ = 136

Equivalent weight of CaSO₄ = Molecular weight / Valency = 136/2 = 68

Now,

Gram equivalent of CaSO₄ = Gram equivalent of CaCO₃

Weight of CaSO₄/Equivalent weight of CaSO₄ = Weight of CaCO₃/Equivalent weight of CaCO₃

or, 68/68 = Weight of CaCO₃/50

Thus, weight of CaCO₃ = 50 mg

In 1000 Litre hardness as of CaCO₃ =  50 mg

Thus, the degree of hardness = 50/1000 mg/L = 0.05 ppm

Hope this answer is helpful.

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