A Closer Examination of the Mechanism of the Hydrogen Peroxide Iodine-Clock Reaction with Respect to the Role of Hypoiodite Species,Journal of Chemical Education

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A Closer Examination of the Mechanism of the Hydrogen Peroxide Iodine-Clock Reaction with Respect to the Role of Hypoiodite Species
Journal of Chemical Education ( IF 2.5 ) Pub Date : 2020-05-14 , DOI: 10.1021/acs.jchemed.9b00006
Ben Ruekberg ₁

Affiliation

One step of the published mechanism of the hydrogen peroxide iodine-clock reaction is called into question by the result of an experimental attempt (predicated on that mechanism) to integrate that reaction into the elephant’s toothpaste demonstration to reveal and control its iodine side product. Under conditions that were a hybrid of those demonstrations (starch and thiosulfate added to the elephant’s toothpaste demonstration), there was a pronounced induction period preceding the appearance of both iodine and oxygen. This induction period for both of these products indicated that the reductant reacted not with iodine but with the transient intermediate, hypoiodous acid (or hypoiodite), common to both iodine and oxygen generation. Additional experiments based on the reaction of thiosulfate with 8 times more moles of hypoiodite than moles of iodine supported this conclusion.

中文翻译：

就次碘酸盐物种的作用，仔细研究过氧化氢碘时钟反应的机理

实验性尝试（以该机理为基础）的结果使已公开的过氧化氢碘钟反应机理的一个步骤受到质疑，该实验试图将该反应整合到大象的牙膏演示中，以揭示和控制其碘副产物。在那些演示混合的条件下（在大象的牙膏演示中添加了淀粉和硫代硫酸盐），在碘和氧气出现之前有一个明显的诱导期。两者的诱导期这些产物的还原反应表明还原剂不是与碘反应，而是与碘和氧气生成所共有的过渡中间体次碘酸（或次碘酸盐）反应。基于硫代硫酸盐与次摩尔碘的8倍摩尔次碘酸盐反应的其他实验支持了这一结论。

更新日期：2020-05-14

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