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Why starch is added near the end point of the titration

Why starch is added near the end point of the titration

Grade:12th pass

1 Answers

Ravleen Kaur
askIITians Faculty 1452 Points
5 years ago
Thestarchindicator isaddedto the solutionnear the endof thetitration, at thepointwhere dilute iodine imparts a pale yellow color to the solution.
Starchforms a very dark blue-black complex with triiodide which can be made by mixing iodine with iodide (often from potassium iodide). However, the complex is not formed if only iodine or only iodide (I−) is present.

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