钴(Ⅲ)钨酸钾氧化亚硫酸氢钠反应动力学与机理(英文)

采用分光光度法研究了酸性水溶液中钴（Ⅲ）钨酸钾氧化亚硫酸氢钠反应的动力学。结果表明对钴（Ⅲ）钨酸钾为零级反应，对亚硫酸氢钠是一级反应，且随氢离子浓度增加反应速率减小，随温度的升高反应速率增大。并由此计算出了反应的活化参数，并提出了合理的反应机理。碱金属离子的催化性能依次为Ｋ＋＞Ｎａ＋＞Ｌｉ＋。

Kinetics and Mechanism of the Reduction of12-Tungstocobaltate(III) by Sodium Sulfate by Spectrophotometry

The kinetics of the reduction of 12-tunngstocobalte(III) by sodium sulfite in aqueous acid solution was studied by spectrophotometry. It was found the reaction rate is independent of the concentration of 12-tungstocobaltate(III) and the order with respect to the concentration of sodium sulfite is unity. The reaction rate decreases with decreasing pH of the solution. The rate constants and activation parameters of the rate-determining step were evaluated. A mechanism involving a preequilibrium and agreeing with the experimental data was proposed. The catalytic activity of the alkali-metal ions follows the order K+ >Na+ >Li+ .