why the end point of titration is wine red to blue?
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Answer:
As the stronger ligand EDTA is added, the CaIn+(aq) complex is replaced by the CaY2-(aq) complex which is blue. The end point of titration is indicated by a sharp colour change from wine red to blue. Titration using Eriochrome Black T as indicator determines total hardness due to Ca2+(aq) and Mg2+(aq) ions.
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Explanation:
Why is the colour of solution wine red before titration and blue colour at the
end of titration
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