Chapter 18, Problem 18.140CP

Interpretation Introduction

Interpretation:

The relative concentration of ${\text{Pb}}^{\text{+2}}{\text{ and Cd}}^{\text{+2}}$ in two half cells when their reduction potential will become equal to each other should be calculated.

Concept introduction

1. The half cell with higher standard reduction potential acts as cathode and with lower reduction potential acts as anode.
2. When the reduction potential values of the two half cells become equal to each other the reaction quotient is called as equilibrium constant.

Given:

The standard reduction potential values for ${\text{Pb}}^{\text{+2}}{\text{/Pb and Cd}}^{\text{+2}}\text{/Cd}$ are $\text{-0}\text{.13V and -0}\text{.40V}$ , respectively.