Environmental engineering

6. Calculate the total hardness, calcium hardness and magnesium hardness for a water sample having a pH of 7.2 and the following concentrations of ions: [Ca+] = 40 mg/L, [Mg?*) = 10 mg/L, [Nat] = 11.8 mg/L, [K+]=7.0 mg/L, [HCM=110 mg/L, [SO]= 67.2 mg/L, [C]=11, mg/L