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Kinetics of Iodous Acid Disproportionation
Article first published online: 24 JUN 2013
© 2013 Wiley Periodicals, Inc.
International Journal of Chemical Kinetics
Volume 45, Issue 8, pages 525–530, August 2013
How to Cite
Schmitz, G. and Furrow, S. D. (2013), Kinetics of Iodous Acid Disproportionation. Int. J. Chem. Kinet., 45: 525–530. doi: 10.1002/kin.20791
- Issue published online: 24 JUN 2013
- Article first published online: 24 JUN 2013
- Manuscript Accepted: 15 FEB 2013
- Manuscript Revised: 20 OCT 2012
- Manuscript Received: 3 AUG 2012
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.