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食鹽是電解質,在它們的水溶液中鐵容易形成原電池發生電化學腐蝕.
如果是書上方程式的問題,就按書上的記,不要問為什麼. 其實Fe3O4是FeO和Fe2O3的混合分子,因為反應物是FeO,所以產物至少大部分是Fe3O4
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