Chapter 19, Problem 33E

Interpretation Introduction

Interpretation:

For the cell reaction, the value of $E^0{}_{{\text{IrO}}_{\text{2}}\text{/ Ir}}$ should be determined.

Concept introduction:

In the special case in which the reactants and products are in their standard states; the standard Gibbs energy change per mole of reaction is given by the following relation:

${\text{Δ}}_{\text{r}}{\text{G}}^{\text{0}}{\text{ = -zFE}}^{\text{0}}{}_{\text{cell}}$

Here, z is number of electrons transferred, F is Faraday’s constant and ${\text{E}}^{\text{0}}{}_{\text{cell}}$ is standard electrode potential of cell.

For a reaction, the Gibbs free energy can also be calculated as follows:

${\text{Δ}}_{\text{r}}{\text{G}}^{\text{0}}$ = ${\text{ΔG}}^{\text{0}}$ (products) - ${\text{ΔG}}^{\text{0}}$ (reactants)