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The hardness of moderately hard water is about _____________

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The hardness of moderately hard water is about _____________

(a) 75-150ppm

(b) 75-120ppm

(c) 75-130ppm

(d) 75-100ppm

I got this question in an internship interview.

The question is from Estimation of Hardness in section Water of Applied Chemistry

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Right choice is (a) 75-150ppm

The explanation: The hardness of CaCO3 of moderately hard water is about 75-150ppm. The hardness of the water can be calculated from amount of calcium and magnesium ions present in water along with bicarbonates, sulphates.

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