Abstract 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 indicated 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.
ZHAO Qi, LIN Su-Hao. Unexpected Digital Experiment Phenomena of Magnesium and Aluminum Battery: Further Inquiry on Reaction of Aluminum and Alkaline Solution[J]. Chinese Journal of Chemical Education, 2018, 39(15): 78-81.
