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QUESTION 2 The following reactions in certain anaerobic soils control the solubility of Fe2+ and Mn2+...

QUESTION 2

The following reactions in certain anaerobic soils control the solubility of Fe2+ and Mn2+ in soil solutions:

γ-MnOOH(s) + 3H+(aq) + e- = Mn2+(aq) + 2H2O E0 = 1.457 V Fe(OH)3(s) + 3H+(aq) + e- = Fe2+(aq) + 3H2O E0 = 1.057 V

(A) Which mineral is the stronger oxidant, γ-MnOOH or Fe(OH)3?

(B) Define the redox equilibrium between γ-MnOOH(s) and Fe2+(aq) using the two half

reactions defined above. In a soil that is at equilibrium with this reaction, what is the concentration of Fe2+(aq) when the concentration of Mn2+ is 10-5 M?

(C) Calculate the Eh and pe of this soil if the pH is 7 and the Mn2+ activity is 10-5M.
(D) If molecular oxygen were introduced into this anaerobic soil system, what would be the

likely sequence of chemical processes with respect to the above reactions?

Solutions

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queen_honey_blossom answered 2 years ago
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