The kinetics of the oxidation of iodine by dichromate ions in acid solution
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Authors
Britton, William L.
Subjects
Advisors
Date of Issue
1962
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
A study of the kinetics of the oxidation of iodine to iodate ion by dichromate ions in acid aqueous solution was undertaken. Ionic strength and temperature were maintained constant and the progress of the reaction was followed by spectrophotometric analysis of unreacted iodine extracted into carbon tetrachloride.
It was established that the reaction was 1/2 order in I2, but no exact relationship was found with hydrogen ion or any hexavalent chromium species. First order dependency on acid and H2CrO4 was found to be a possibility, or at least a useful approximation, although a more precise knowledge of all Cr(VI) equilibria relations at high ionic strengths than is available would be needed for verification. A multi-step rate determining mechanism is possible, although low iodine solubility coupled with high required concentrations of other constituents limit available techniques and would probably, in this event, make determination of the complete rate expression difficult.
The advice and experience of Professor Richard A. Reinhardt have been invaluable in this investigation and his assistance is gratefully acknowledged.
Type
Thesis