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Q.

Which of the following ligand is used to estimate the hardness of water

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a

Ox

b

en

c

Na2EDTA

d

Carboxy peptidase

answer is A.

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Detailed Solution

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  • Hardness of water is estimated by simple titration with Na2EDTA.
  • The Ca2+ and Mg2+ ions form stable complexes with EDTA. 
  • The selective estimation of these ions can be done due to difference in the stability constants of calcium and magnesium complexes.
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