Kinetics and mechanism of the autocatalytic reaction between iodine and chlorite ion

G. Rábai, Mihály T. Beck

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

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 Cl2O2 seem 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
Volume26
Issue number8
Publication statusPublished - 1987

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Iodine
iodine
Ions
Kinetics
kinetics
pH
Hypochlorous Acid
Oxidation
ions
Chlorine
Stoichiometry
chlorine
oxidation
hydrogen ions
ion concentration
chlorite
dioxides
stoichiometry
acids
chlorine dioxide

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Kinetics and mechanism of the autocatalytic reaction between iodine and chlorite ion. / Rábai, G.; Beck, Mihály T.

In: Inorganic Chemistry, Vol. 26, No. 8, 1987, p. 1195-1199.

Research output: Contribution to journalArticle

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