Question

(iii) Why is it conventional to express hardness of water in terms of Caco
equivalent at the International level? ​

Answer 1

Answer:

When hardness is expressed as 'mg/l as CaCO3', it's calculated as if all the calcium and magnesium were present only as calcium carbonate. Hard water is a mixture of calcium and magnesium, together with bicarbonate, sulphate, chloride, etc. Ca – is calcium, C carbon and O oxygen. ... This makes CaCO3 calcium carbonate.