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Understanding Rusting and the Redox Cycle in Metals

Learn about rusting, an electrochemical process of oxidation of metal like iron, forming Fe2O3, through the redox cycle with keywords like reduction, extraction, metal oxide, corrosion, and more.

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Understanding Rusting and the Redox Cycle in Metals

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  1. Rusting.

  2. Rusting and the redox cycle Reduction Extraction Metal oxide Fe3+ Metal Fe Corrosion Oxidation

  3. Rusting is an electrochemical process O2 O2 Fe2O3.xH2O (rust) +O2(aq) 2OH- + Fe2+  Fe(OH)2 O2 O2 ½ O2 + 2e- +H2O  2OH- Fe2+ Fe e- e- Fe  Fe2+ + 2e-

  4. Fe2+ + 2e-Fe EΘ= -0.44V Oxidised Fe  Fe2+ + 2e- Reduced ½ O2 +2e- + H2O  2OH- ½ O2 +2e- + H2O + Fe  2OH- + Fe2+ + 2e- Precipitation Fe2+ (aq)+ 2OH- (aq)  Fe(OH)2 (s) Oxidised Fe(OH)2 (s)  Fe2O3. x H2O (s) ½ O2 +2e- + H2O 2OH-EΘ= +0.40V

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