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Kinetics of iodous acid disproportionation

par Schmitz, Guy ;Furrow, Stanley
Référence International journal of chemical kinetics, 48, 8, page (525-530)
Publication Publié, 2013-08

Article révisé par les pairs

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Résumé :

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.