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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Published in | International journal of chemical kinetics Vol. 45; no. 8; pp. 525 - 530 |
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Main Authors | , |
Format | Journal Article |
Language | English French German |
Published |
Hoboken
Blackwell Publishing Ltd
01.08.2013
Wiley Subscription Services, Inc |
Subjects | |
Online Access | Get full text |
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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. |
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Bibliography: | ArticleID:KIN20791 istex:DA0284E18C56BAC1EEF0C645736939E605B5CF8E ark:/67375/WNG-NJJNCKBG-W www.wileyonlinelibrary.com . Supporting Information is available in the online issue at |
ISSN: | 0538-8066 1097-4601 |
DOI: | 10.1002/kin.20791 |