1.

The hardness of a water sample (in terms of equivalents of CaCO3) containing 10–3M CaSO4 is : (molar mass of CaSO4 = 136g mol–1) (1) 10ppm (2) 90ppm (3) 50ppm (4) 100ppm

Answer»

The correct option (4) 100 ppm

Explanation:

Moles of CaSO4 = 10–3 moles 

Mass of water = 1000g 

DOH (in terms of CaCO3) = (10-3 x 100)/1000 x 106 = 100ppm



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