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在人教版化学必修1第三章“金属及其化合物”中,铝与氢氧化钠溶液反应生成氢气的实验操作虽然简单,却无法反映出铝与氢氧化钠溶液反应的本质,学生不能通过实验现象判断该反应的氧化剂。将氢氧化钠水溶液替换为氢氧化钠无水乙醇溶液,通过改变溶液中水的含量对生成氢气的影响这一实验现象进行对比,可以有效解决该问题。由于无水乙醇不易保存,故可借助翻转课堂的方式,将本实验制成微视频,供学生课前观看学习。一、实验原理
In PEP Chemistry, Chapter 3, “Metals and Compounds,” the experimental operation of aluminum reacting with sodium hydroxide to generate hydrogen is simple, but it does not reflect the nature of the reaction between aluminum and sodium hydroxide solution. The oxidant of the reaction cannot be judged by experimental phenomena. The sodium hydroxide aqueous solution was replaced by an anhydrous ethanol solution of sodium hydroxide, and the effect of changing the water content of the solution on the generation of hydrogen was compared. This problem can be effectively solved. Since anhydrous ethanol is not easy to preserve, this experiment can be made into micro-videos for the students to watch before class by turning the classroom. First, the experimental principle