亚硫酸钠溶液和六价铬盐溶液反应实验探究

Experimental Inquiry on Reaction Between Na_(2)SO_(3) Solution and Chromium(Ⅵ)Salt Solution

以亚硫酸钠溶液和铬(Ⅵ)盐溶液构建的复杂反应体系为例,借助控制变量法,探究了溶液的酸碱性、溶液的浓度、溶液的溶解氧等因素是否对亚硫酸钠溶液和铬(Ⅵ)盐溶液发生氧化还原反应产生影响。实验结果表明:亚硫酸钠溶液和铬(Ⅵ)盐溶液的反应与溶液酸碱性有关,溶液酸性增强,铬(Ⅵ)盐溶液的氧化性增强,对亚硫酸钠溶液的还原性几乎无影响,且溶液体系中的溶解氧对铬(Ⅵ)盐溶液的氧化性随酸性增强而增强的影响不大。

Taking the complex reaction system constructed by Na_(2)SO_(3)solution and chromium(Ⅵ)salt solution as an example,the control variate method was used to explore whether the factors such as the acidity and alkalinity of the solution,the concentration of the solution,and the dissolved oxygen of the solution affected the redox reaction of Na_(2)SO_(3)solution and chromium(Ⅵ)salt solution.The experimental results show that the reaction between Na_(2)SO_(3)solution and chromium(Ⅵ)salt solution is related to the acidity and alkalinity of the solution.The acidity of the solution increases,while the oxidizing ability of chromium(Ⅵ)solution increases,the reducing ability of Na_(2)SO_(3)solution has almost no effect.and the dissolved oxygen in the solution system has little effect on the increasing oxidizing ability of chromium(Ⅵ)solution with increasing acidity.