Chapter 18, Problem 18.78SP

Interpretation Introduction

Interpretation:

To determine the standard reduction potential for the $E{u}^{3+}/E{u}^{2+}$ half cell

Concept introduction:

The standard potential of the galvanic cell is sum of standard half-cell potentials of reduction at cathode and oxidation at anode:

${\text{E°}}_{\text{cell}}\text{=}{\text{E°}}_{\text{ox}}{\text{+E°}}_{\text{red}}$

Given:

  $\begin{array}{l}\text{E°=0}\text{.40V}\\ \text{Galvanic cell:}\\ {\text{Zn(s)|Zn}}^{\text{2+}}{\text{(aq)||Eu}}^{\text{3+}}{\text{(aq),Eu}}^{\text{2+}}\text{(aq)|Pt(s)}\end{array}$