Chapter 19, Problem 16E

Interpretation Introduction

Interpretation:

The species which is capable of reducingEu³⁺(aq) to Eu²⁺(aq) needs to be determined.

Concept introduction:

There should be positive $E{°}_{\text{cell}}$ value in order to accomplish any reaction for the given direction. This is because for every spontaneous reaction, the value of $\Delta G^o$ should be negative. The relation between $\Delta G^o$ and $E{°}_{\text{cell}}$ is represented as follows:

$\Delta G^o=-nFE{°}_{\text{cell}}$

For positive value of $E{°}_{\text{cell}}$, the value of $\Delta G^o$ will be negative.

The $E{°}_{\text{cell}}$ value for a redox reaction is given by following equation.

$E{°}_{\text{cell}}=E{°}_{\text{Reduction}}-E{°}_{\text{Oxidation}}$