(a) What is the principle of EDTA method? Describe the estimation of…

Previous year question for Applied Engineering Chemistry.

Question

(a) What is the principle of EDTA method? Describe the estimation of hardness of water by EDTA method. (12)

(b) Calculate non-carbonate hardness and total hardness of a water sample containing–

$ ext{Mg(HCO}_3)_2 - 7.3 \text{ mg/L}$

$\text{Ca(HCO}_3)_2 - 16.2 \text{ mg/L}$

$\text{MgCl}_2 - 0.5 \text{ mg/L}$

$\text{CaSO}_4 - 13.6 \text{ mg/L}$ (8)