Question

Hardness of water is 200 ppm the normality and molarity of caco3 in water is

Answer 1

The source water has high calcium (204 mg/L as CaCO3), high magnesium carbonate hardness (84 mg/L as CaCO3) and since the total hardness is less than the carbonate and bicarbonate alkalinity, then the total hardness is equivalent to the carbonate hardness and the noncarbonated hardness is zero.

Answer 2

1 mg/L = 1 mg of CaCO3 eq hardness in 1 litre of water. But one litre of water weights =1 kg =1000g = 1000 x 1000 mg = 106 mg = 1 ppm. 3. Clark's degree (°Cl): The number of parts of calcium carbonate equivalent hardness presents in 70,000 or (7×104) parts of water !