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Corrosion is the electrolytic oxidation of metals by air, the half equation for the rusting of...

Corrosion is the electrolytic oxidation of metals by air, the half equation for the rusting of iron is shown below:

1/2 O2 (g) + H2O (l) + 2e- --> 2OH- (aq) Eo = 0.40V

Fe2+ (aq) + 2e ---> Fe (s) Eo = -0.44V

Write the overall equation for the rusting process and calculate the emf of this reaction under standard conditions.

Standard conditions arent normally found in the environment, where the pressure of O2 (g) is 0.2 atm, pH of rain is approx. 5, which modifies the Ecell of O2, H2O/OH system to +0.66V, how will this affect the rusting process.

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