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(B) The hardness of water is expressed in terms of $CaCO_3$ equivalents in parts per million $(ppm)$.This is done because $CaCO_3$ has a molecular wei

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Parts per million by weight of $CaCO_3$ whether actually present or not

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(B) The hardness of water is expressed in terms of $CaCO_3$ equivalents in parts per million $(ppm)$.This is done because $CaCO_3$ has a molecular weight of $100 \ g/mol$,which makes calculations convenient.It represents the total concentration of calcium and magnesium salts present in the water,expressed as if they were all $CaCO_3$.

The degree of hardness of water is usually expressed in terms of which of the following?

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