Ferrous iron calculated changes

The group of microorganisms known as autotrophic bacteria obtain energy from the oxidation of a variety of inorganic compounds (ammonia, nitrite, sulfide, ferrous iron, hydrogen, carbon monoxide, sulfur, thiosulfate).The free energy changes and over-all efficiencies of a number of these processes have been calculated. We may take as an example the oxidation of nitrite to nitrate performed by Nitrobacter... 

Consider now the dissolution of iron by replacing the Pt WE with an Fe wire and adding 1 M Fe2+ to the solution in chamber B (via dissolution of FeS04, for example), as shown in Fig. 22. Calculation of the reversible potential for iron dissolution indicates that it would be the same as the standard reversible potential, -0.44 V (NHE), as the ferrous ion is at unit activity. We will assume that only iron oxidation/reduction can occur in this cell. Changing the polarity of the variable voltage supply allows removal of electrons from the WE, forcing net oxidation to occur there and net reduction to occur on the Pt CE in chamber C. Figure... 

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