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The hardness of moderately hard water is about _____________(a) 75-150ppm(b) 75-120ppm(c) 75-130ppm(d) 75-100ppmI got this question in an internship interview.The question is from Estimation of Hardness in section Water of Applied Chemistry

Answer» 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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