Answer to Question #202661 in Physical Chemistry for Gaurav Dhiran

Question #202661

How will you estimate Zn2+ in zinc sulfate solution by titrimetric method? Explain in detail with chemical structure of required indicator.


1
Expert's answer
2021-06-06T20:16:01-0400

Zinc content in a sample can be determined quantita- tively by complexometric titration with EDTA at pH 5.5. The effective formation constant of the Zn-EDTA complex is ≥ 106 above pH 4 (3). Xylenol Orange is used as an indi- cator; it is yellow when it is free and red when complexed with zinc.


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