Chapter 17, Problem 55QRT

(a)

Interpretation Introduction

Interpretation:

The effect of decrease in the concentration of ${\text{Cd}}^{2+}$ on the value of $E_{\text{cell}}$ has to be predicted with an explanation in terms of Le Chatelier’s principle.

Concept Introduction:

Le Chatelier’s principle states that whenever there is the effect of change in the conditions on an equilibrium reaction, the equilibrium will shifts in the direction so as to neutralize the effect.

(b)

Interpretation Introduction

Interpretation:

The time period for which the battery can operate has to be calculated.

Concept Introduction:

When electricity is passed through ionic compound or through an electrolyte, a chemical reaction known as electrolysis takes place.  The apparatus where electrolysis takes place is known as an electrolytic cell.  The sign of cathode is negative where reduction takes place and anode sign is positive where oxidation takes place.