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原电池化学式疑问

分类: 作业答案 • 2022-01-28 00:05:16

问题描述：

原电池化学式疑问
一次电池的正极反应：2MnO2+2H2O+2e-======2MnOOH+2OH-
这里为什么不把2约掉?

答

如果单写正极方程式可以约掉
但如果和负极反应式及总反应式一起出现的话
为了保证总反应式减去负极反应式得到正极反应式
2就不约掉了

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