A sensitive method for I- in the presence of Cl- and Br- entails oxidation of the I- to IO3- with Br2. The excess Br2 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 I2. 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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