The reagent commonly used to determine hardness of water titrimetrically is `:`
A. Oxalic acid
B. Disodium of EDTA
C. Sodium citrate
D. Sodium thiosulphate
A. Oxalic acid
B. Disodium of EDTA
C. Sodium citrate
D. Sodium thiosulphate
Correct Answer – B
It forms calcium and magnesium complex with EDTA salt.