Chapter 15.3, Problem 30PP

(a)

Interpretation Introduction

Interpretation:

Write the half- reactions and the overall cell reaction for the given voltaic cell

  $\text{Al}(s)|{\text{Al}}^{3+}(aq)||{\text{Cd}}^{2+}(aq)|\text{Cd}(s)$

Concept Introduction :

The shorthand notation of a cell reaction indicates phase boundary by a single vertical line $\text{(}|)$ and salt bridge is denotes by a double vertical line $\text{(}\left|\right|)$ . In this notation on the left side of salt bridge oxidation reaction which occurred at anode and on the right side of salt bridge; reduction reaction which occurred at cathode. The electrodes are written on the extreme corners; anode on extreme left and cathode on extreme right. The reactants in each half-cell are always first, followed by the products.

For the positive standard cell potential, the reaction is spontaneous in nature and for negative value it is non-spontaneous.

(b)

Interpretation Introduction

Interpretation:

Write the half- reactions and the overall cell reaction for the given voltaic cell

  $\text{Sn}(s)|{\text{Sn}}^{2+}(aq)||{\text{Fe}}^{3+}(aq)|{\text{Fe}}^{2+}(aq)|C(\text{ electrode })$

Concept Introduction :

The shorthand notation of a cell reaction indicates phase boundary by a single vertical line $\text{(}|)$ and salt bridge is denotes by a double vertical line $\text{(}\left|\right|)$ . In this notation on the left side of salt bridge oxidation reaction which occurred at anode and on the right side of salt bridge; reduction reaction which occurred at cathode. The electrodes are written on the extreme corners; anode on extreme left and cathode on extreme right. The reactants in each half-cell are always first, followed by the products.

For the positive standard cell potential, the reaction is spontaneous in nature and for negative value it is non-spontaneous.