21. Solving a chemistry problem

21. Solving a chemistry problem

6. The enzymatic respiratory chain ends with cytochrome oxidase, which transfers electrons to activated oxygen. The overall reaction can be represented as
2cyt c(red) 1/2O2 2H = 2cyt c(ox) H2O, E0 (25 °C, pH = 7) = 0.562 V.
Calculate the standard Gibbs energy of this reaction. In what direction will the reaction go when the acidity of the solution changes to: (a) pH = 4. (b) pH = 9?

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