MHT CET · Chemistry · Coordination Compounds

Ligand used in the estimation of hardness of water

A EDTA
B DBG
C chloride
D bromo

Verified Solution

Answer & Solution

Correct Answer

(A) EDTA

Step-by-step Solution

Detailed explanation

The hardness of water is due to the presence of \(\text{Ca} ^{2+}\) and \(\text{Mg} ^{2+}\) ions in it. The hexadentate ligand EDTA forms stable complexes with \(\text{Ca} ^{2+}\) and \(\text{Mg} ^{2+}\) ions and can be used for the estimation of hardness of water by simple titration method. Further, of \(\text{Ca} ^{2+}\) and \(\text{Mg} ^{2+}\) ions, each can be selectively estimated by this method because of the difference in the stability constants of their EDTA complexes.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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