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What is the concentration of Fe2+?

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At pH 6.00 and pE 2.70, what is the concentration of Fe2+ (mol/L) in equilibrium with Fe(OH)3?

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This solution provides 275 words of explanation and calculations.

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I always like to find some materials on the net to aid in the instruction:

http://www.science.duq.edu/esm/Course_Material/ESM552/Notes/Chapter4/chapter4.html

Actually looks like this idea is relatively new in the discussion of a pE, which is a guage of a systems oxidizing or reducing potential pE = - log (activity of the electrons) if the activity is 1 PE is zero and Ecell is ...

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