Answer to Question #292708 in Organic Chemistry for Kaushik

Question

Calculate the total hardness of a sample of water containing following impurities 16.2 

mg/L of Ca(HCO3)2, 11.1 mg/L of CaCl2, 60 mg/L of CaSO4 and Mg(HCO3)2, 11.2 mg/L 

of MgCl2, 60 mg/L of MgSO4 and 19 mg/L of Mg(NO3)2.

Answer 1

Permanent hardness due to MgCl2 and CaSO4 = (60+60)mg/L = 120mg/L (or) 120ppm.