Question

Why is degree of hardness expressed in terms of caco3 equivalent?

Answer 1

The hardness of water is expressed in terms of ppm because the molecular weight of calcium carbonate $\bold{CaCO_3}$
is 100gm/mol.
It is easy to calculate. This is one of the main reason for expressing the hardness of water in ppm.

➡️calcium carbonate is insoluble in water therefore it is easy to calculate its amount in water.✔️✔️✔️

Answer 2

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