Write a complete balanced redox reaction, wherein electron(s) are transferred be

Question

Write a complete balanced redox reaction, wherein electron(s) are transferred between Cytochrome b and lactate (or pyruvate), that would occur spontaneously in the forward direction. Be sure to clearly indicate the states of all species on the reactant and product sides: cytochrome b (Fe3+) or cytochrome b (Fe2+); lactate or pyruvate. For the complete balanced redox reaction that you've written, how many electrons are being transferred,which species is acting as the electron donor and which species is acting as the reducing agent?

Explanation / Answer

Pyruvate +2H+ 2e-   --- > lactate    -0.185

Cytochrome b [Fe3+]+ e- - -- > cytochrome b [Fe2+]        +0.075

Which species has a negative value for E0 has the tendency of the reduction thus between the reaction of Cytochrome b and lactate (or pyruvate) ; pyruvate will reduced and cytochrome b will oxidized.

Pyruvate +2H+ 2e-   --- > lactate   

2 cytochrome b [Fe2+] --- >2 Cytochrome b [Fe3+]+ 2e-

Pyruvate +2H+2 Cytochrome b [Fe2+]+ --- > lactate +2 Cytochrome b [Fe3+]

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