对中学阶段Cl~-先于OH~-放电的顺序,从工业生产和高考试题两个角度证实了其合理性。但这并不能说明任何条件下,此顺序都成立。通过电解浓度同是1 mol/L的氢氧化钠和氯化钠混合溶液发现,阳极放电的是氢氧根离子而不是氯离子,并从理论角度对实验事实进行了深度剖析。离子放电受诸多因素影响,因此离子间的放电顺序相对较复杂。中学阶段一定条件下的经验总结如果泛规律化,很容易将教学引入误区,危害科学知识的传承。 The secondary school Cl ~ - prior to the OH ~ - discharge order, from the industrial production and college entrance examination questions from two angles confirmed its rationality. But this does not mean that under any conditions, the order is valid. The electrolysis concentration of 1 mol / L sodium hydroxide and sodium chloride mixed solution found that the anode discharge of hydroxide ions instead of chloride ions, and from a theoretical point of view of the experimental facts in-depth analysis. Ion discharge is affected by many factors, so the order of discharge between ions is relatively complex. Lessons learned under certain conditions of high school stage If the pan-law, it is easy to put the teaching of misunderstanding, endanger the transmission of scientific knowledge.