【摘要】 按照实验教材给出的方法所制备的高锰酸钾含有超过50%的杂质,因此有必要对该制备方法进行改进。本文在深入分析其失败原因的基础上提出了一系列改进措施,包括用磷酸来调节K₂MnO₄歧化反应的pH值;pH控制在11～12之间;采用G4型玻璃砂芯漏斗彻底除去未反应完的MnO₂原料;利用水浴加热来蒸发结晶得到产品。实验结果表明,改进方法后所得到的产品中高锰酸钾的含量显著提高到88.34%。更多还原

【Abstract】 The technique of preparing KMnO₄ was needed to improve because the product obtained by the method in the experimental textbook contained too much impurity（ >50%）. Several measures were adopted to enhance the purity of product. 1 M H₃PO₄ was used to adjust the p H value of the disproportionation reaction of K₂ MnO₄. The p H value should be controlled between 11 and 12. The mixture was filtered by the G4 sintered-glass filter to utterly remove of the residual MnO₂ raw material. KMnO₄ solution was heated by the water bath to get the final product. The product prepared by the improved technique contained 88. 34% of KMnO₄.更多还原