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What is the pE value in an acid mine water sample having [Fe3+] = 6.79E-3 M and [Fe2+] = 4.14E-4 M?

For HCN in water, Ka = 2.0E-10. Calculate the fraction of cyanide that exists as the anion rather than in the molecular form at pH values of 4, 7, and 10.

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