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1.在原电池中,活泼金属一定做负极。辨析错。在某些原电池中是不活泼金属做负极。例如,以 Mg 和 Al 做电极、NaOH 溶液做电解质溶液构成的原电池中,Al 做负极,Mg 做正极。电极反应分别为:正极(Mg):6H_2O+6e~-=3H_2↑+6OH~-负极(Al):2Al+80H~--6e~-=2AlO+2~-+4H_2O电池总反应:2Al+2OH~-+2H_2 O=2AlO_2~-+3H_2↑又如,以铁棒和铜棒做电极、浓硝酸做电解质溶液构成的原电池中,铜做负极,铁做正极。电极反应分
In the original battery, lively metal must do negative. Discrimination wrong. In some primary batteries is not active metal anode. For example, to do with Mg and Al electrodes, NaOH solution electrolyte solution to make the original battery, Al as the negative electrode, Mg as the positive electrode. The electrode reactions are as follows: Positive electrode (Mg): 6H 2 O + 6e ~ - = 3H_2 ↑ + 6OH ~ - Negative electrode (Al): 2Al + 80H ~ - 6e ~ - = 2AlO + 2 ~ - + 4H_2O Battery total reaction: 2Al + 2OH ~ - + 2H_2 O = 2AlO_2 ~ - + 3H_2 ↑ Another example, with iron rods and copper rods as electrodes, concentrated nitric acid electrolyte solution to make the original battery, copper as the negative, iron as the positive. Electrode reaction points