Question: A sensitive method for I in the presence of Cl and Br entails oxidation of the I to IO3 with Br. The excess Br is

A sensitive method for I¯ in the presence of Cl¯ and Br¯ entails oxidation of the I¯ to IO3¯ with Br¯. The excess Br¯ is then removed by boiling or by reduction with formate ion. The IO3¯ produced is determined by addition of excess I¯ and titration of the resulting I¯. A 1.307-g sample of mixed halides was dissolved and analyzed by the foregoing procedure. A volume of 19.72 mL of 0.04926 M thiosulfate was required for the titration. Calculate the percentage of KI in the sample.

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