Kinetics of Iodous Acid Disproportionation

ABSTRACT The iodous acid disproportionation is autocatalytic, and it is not easy to measure the rate constant of the step 2IO2H → IO3− + IOH + H+ separately. Hg(II) was used previously to suppress the autocatalytic pathway, but this method presents difficulties discussed in this work. A more effecti...

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Bibliographic Details
Published inInternational journal of chemical kinetics Vol. 45; no. 8; pp. 525 - 530
Main Authors Schmitz, Guy, Furrow, Stanley D.
Format Journal Article
LanguageEnglish
French
German
Published Hoboken Blackwell Publishing Ltd 01.08.2013
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Subjects
Oxidation
Studies
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Summary:ABSTRACT The iodous acid disproportionation is autocatalytic, and it is not easy to measure the rate constant of the step 2IO2H → IO3− + IOH + H+ separately. Hg(II) was used previously to suppress the autocatalytic pathway, but this method presents difficulties discussed in this work. A more effective method is the use of crotonic acid, an effective IOH scavenger. It suppresses side reactions, and a purely second‐order rate law is obtained. The rate constant decreases from 5 to 0.2 M−1 s−1 when the sulfuric acid concentration increases from 0.08 to 0.60 M. The observed decrease could be explained if IO2− reacts faster than IO2H. This may have consequences for the mechanism of the oscillating Bray–Liebhafsky reaction.
Bibliography:ArticleID:KIN20791
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ISSN:0538-8066
1097-4601
DOI:10.1002/kin.20791