Chapter 20.5, Problem 20.9.1PE

Interpretation Introduction

Interpretation: The elements that oxidize ${\text{Fe}}^{2+}$ to ${\text{Fe}}^{\text{3+}}$ among the given elements is to be determined.

Concept introduction: The feasibility of the reaction depends upon the value of $\Delta G^{\circ }$ . The reaction is feasible if the value of $\Delta G^{\circ }$ is negative. The $E_{\text{cell}}^{\circ }$ of the cell is related to $\Delta G^{\circ }$ by the formula,

$\Delta G^{\circ }=-nF{E}_{\text{cell}}^{\circ }$

According to the above equation, the value of $\Delta G^{\circ }$ is negative for the positive value of $E_{\text{cell}}^{\circ }$ . Hence, for the reaction to be feasible, the value of $E_{\text{cell}}^{\circ }$ should be positive.

To determine: The elements that oxidize ${\text{Fe}}^{2+}$ to ${\text{Fe}}^{\text{3+}}$ among the given elements.