碘钟颜色震荡反应的研究

Study on Briggs-Rauscher Oscillation Reaction

在过氧化氢1.2 mol/L、丙二酸0.05 mol/L、硫酸锰0.006 7 mol/L、碘酸钾0.067 mol/L、淀粉0.01%的溶液中逐滴滴加适量浓硫酸,反应液呈现从黄色到蓝色相互交替的颜色震荡现象。提出了以碘离子为核心,不同价态的碘化合物作为媒介,溶液内各物质的浓度发生周期性变化的反应机理。研究结果表明当p H值处于2.05~2.35之间时,溶液可以达到黄色与蓝色双稳态的平衡,震荡时间根据p H差异可以维持3~5 min,最终变为蓝色。

Adding the oil of vitriol drop by drop to the liquor which contains potash iodate 0.066 mol/L, hydrogen peroxide 1.2 mol/L, malonic acid 0.05 mol/L, manganous sulfate 0.006 7 mol/L and 0.01% starch, it can be observed that the liquor is amber at first, later blue. The essay put forward the reaction centered on iodide ions and based on the various valence state of iodine in which the concentrations of different matters change in a periodic way. It turns out that the liquor can achieve a balance between amber steady state and blue steady state within pH 2.05 to 2.35. The liquor can maintain changing for three to five minutes and turn to blue in the end.