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Ligand used in the estimation of hardness of water

Options

  1. AEDTA
  2. BDBG
  3. Cchloride
  4. Dbromo

Correct answer

A. EDTA

Step-by-step solution

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

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