做过高锰酸钾一系列的化学实验后,玻璃仪器上会留有MnO_2斑迹,常采用的方法是用浓盐酸或亚硫酸钠溶液处理。笔者经过实验证明选择过氧化氢溶液(即双氧水)效 After a series of chemical experiments with potassium permanganate, MnO 2 spots are left on the glass instrument. The commonly used method is to use concentrated hydrochloric acid or sodium sulfite solution. The author experimentally demonstrated the choice of hydrogen peroxide solution (ie, hydrogen peroxide)