Kinetics and Mechanism of the Autocatalytic Reaction between Iodine and Chlorite Ion

Gyula Rábai, Mihály T. Beck

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The kinetics of oxidation of iodine by chlorite is much more complicated than previously found. The rate exhibits a minimum as a function of hydrogen ion concentration, the reaction being characteristically autocatalytic, mainly due to the fact that oxidation of iodine is even faster by hypochlorous acid and chlorine. An important feature of the reaction is the acceleration of the disproportionation of chlorite by the intermediates of the title reaction, leading to the formation of a significant amount of chlorine dioxide. The rate cannot be described by an overall equation, but all the findings can be quantitatively explained by a mechanism consisting of 13 elementary or quasi-elementary steps. The stoichiometry of the reaction is kinetically controlled. Formation and reactions of Cl2O2seem to play a crucial role in the reaction and in other reactions involving chlorite.

Original languageEnglish
Pages (from-to)1195-1199
Number of pages5
JournalInorganic Chemistry
Issue number8
Publication statusPublished - Apr 1 1987


ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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