alleryHardness of water is estimated by titration with:
AKMnO₄
BHCl
CNa₂EDTA — forms stable complexes with Ca²⁺ and Mg²⁺
DAgNO₃
Answer & Solution
Correct answer: C. Na₂EDTA — forms stable complexes with Ca²⁺ and Mg²⁺
**Na₂EDTA** forms very stable hexadentate chelates with **Ca²⁺ and Mg²⁺** (the ions responsible for water hardness).
Selective titration uses different stability constants and buffered pH to estimate Ca and Mg separately.
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