Discussion
Hardness of water is estimated by titration with
Answer: D
Hardness is estimated by titration with \(Na_{2}\)EDTA.
The disodium salt of EDTA forms stable 1:1 complexes with \(Ca^{2+}\) and \(Mg^{2+}\). Titrating a water sample with it (using an indicator such as Eriochrome Black T) measures the total concentration of these ions, which is the hardness.
DMG detects nickel, cupron copper, and \(\alpha\)-nitroso-\(\beta\)-naphthol cobalt; ethylenediamine is a bidentate ligand but is not the titrant for hardness.
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