O2(g) + 2H2O(l) +4e-  → 4OH-(aq), Fe(s) → Fe2+(aq) + 2e-, Fe2+(s) + 2OH-(aq) → Fe(OH)2(s) , Fe(OH)2(s) + OH-(aq) → Fe(OH)3(aq) + e-, 2Fe(OH)3 · nH2O(s) → Fe2O3(s) + (n+3)H2O(l).

Rusting: Reaction Equation

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