摘要
用电压传感器测得使用铝、镁作电极,氢氧化钠溶液或氨水作电解质的原电池,在放电过程中存在电极极性翻转现象,说明铝片不仅能与强碱反应,也能与氨水反应。该结论和铝片和氨水反应的试管实验的结果一致。换用碳酸钠溶液作电解质的原电池不存在电极极性翻转现象;结合试管实验中铝片与碳酸钠溶液反应的产物分析,发现有难溶于水的碱式碳酸钠铝生成,推测其覆盖在铝片表面,避免了电极极性翻转。
This paper used voltage sensor to measure the voltage of primary battery with aluminum and magnesium as electrode and sodium hydroxide solution or ammonia as electrolyte solution, it was found that electrode polarity reversed in the discharge process. This phenomenon in dicated that aluminum could not only react with sodium hydroxide, but also react with ammonia, this conclusion was proved by the tube experiment. While using sodium carbonate solution as electrolyte solution, the electrode polarity did not reverse, the reaction between aluminum and sodium carbonate solution generated basic sodium aluminum carbonate which was difficult to dissolve in alkaline solution, it covered surface of aluminum to avoid the reverse of electrode polarity.
作者
赵琦
林肃浩
ZHAO Qi;LIN Su-Hao(Hangzhou No.9 High School,Hangzhou 310020,China;Hangzhou No.2 High School,Hangzhou 310053,China)
出处
《化学教育（中英文）》
CAS
北大核心
2018年第15期78-81,共4页
Chinese Journal of Chemical Education
关键词
镁铝原电池
碱性溶液
数字化实验
magnesium and aluminum battery
alkaline solution
digital experiment
