In the titration of I2 solutions with Na2S2O3, the starch indicator is never added until just before

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In the titration of I2 solutions with Na2S2O3, the starch indicator is never added until just before chemical equivalence. Why?
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Fundamentals of Analytical Chemistry

ISBN: 978-0495558286

9th edition

Authors: Douglas A. Skoog, Donald M. West, F. James Holler, Stanley R. Crouch

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