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51问答网 > NAOH做电解液，连接好铝和镁组成原电池，正极和负极电子式分别是什么，为什么

NAOH做电解液，连接好铝和镁组成原电池，正极和负极电子式分别是什么，为什么

2025-03-15 08:54:08

推荐回答（1个）

回答1：

负极——铝，电极反应为：2 Al - 6 e + 8 OH- = 2 AlO2 - + 4 H2O
正极——镁，电极反应为：6 H+ + 6 e = 3 H2↑
电池总的反应为：2 Al + 2 NaOH + 2 H2O = 2 NaAlO2 + 3 H2↑
铝在碱性环境中比镁容易失去电子，所以铝应该是负极材料。

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