Calculate the hardness in terms of CaCO3   equivalent if 32.1 mg/l CaSO4 is present in water sample.a.24 mg/lb.13 mg/lc.32.10 mg/ld.23.60 mg/l

To calculate the hardness in terms of CaCO3 equivalent, we need to know the equivalent weight of CaCO3 and CaSO4.

The molecular weight of CaCO3 is approximately 100 g/mol and for CaSO4 it is approximately 136 g/mol.

The equivalent weight of CaCO3 is its molecular weight, which is 100 g/mol. The equivalent weight of CaSO4 is also its molecular weight, which is 136 g/mol.

The hardness in terms of CaCO3 can be calculated using the formula:

Hardness as CaCO3 = (ppm of substance * equivalent weight of CaCO3) / equivalent weight of substance

Substituting the given values into the formula:

Hardness as CaCO3 = (32.1 mg/l * 100 g/mol) / 136 g/mol

Hardness as CaCO3 = 23.6 mg/l

So, the correct answer is d. 23.60 mg/l.