The Oxidation of Iodide Ion by Persulfate Ion. V. The Rate at Low Ionic Strength

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Abstract

The titration of iodine with thiosulfate has been investigated in solutions 5 × 10-6 to 7 × 10 -5 molar, using starch as the indicator, and empirical “calibration curves” have been established for various concentrations of potassium iodide and nitrate. The rate of the persulfate-iodide ion reaction has been investigated between the ionic strengths 0.0006 and 0.025, by titrating the iodine formed and applying corrections as indicated by the “calibration curves.” The primary salt effect is found to be in agreement with the predictions of the Bronsted theory. The rate measurements are in excellent agreement with those found previously in this Laboratory by a different experimental method. © 1938, American Chemical Society. All rights reserved.

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Knudsen, O. M., & King, C. V. (1938). The Oxidation of Iodide Ion by Persulfate Ion. V. The Rate at Low Ionic Strength. Journal of the American Chemical Society, 60(3), 687–691. https://doi.org/10.1021/ja01270a053

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