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Determining Redox Potentials of Acid Water

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What is the redox potential of an acid mine water sample having Fe3+ = 7.00E-3 M and Fe2+ = 3.00E-4 M given that E0 (standard electrode potential) for the Fe3+/Fe2+ couple is 0.77V

I have failed at this problem several times so it would be great if you could work it out.

Hint: Nernst equation.

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