Discussion
EDTA estimates hardness by forming with calcium and magnesium ions a
Answer: C
Correct answer: stable complex
EDTA is a hexadentate chelating agent: its four carboxylate groups and two nitrogen atoms wrap around a metal ion and bind it at six points, giving a very stable one-to-one complex. Nothing precipitates and nothing is evolved, so the titration is followed by the indicator colour change rather than by any visible reaction.
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