Chapter 22, Problem 108A

Interpretation Introduction

Interpretation: To explain the term standard cell potential.

Concept Introduction: Cell potential is defined as the difference between the reduction cell potentials of two half-cells.

Answer to Problem 108A

The difference between reduction cell potentials determines the standard cell potential.

Explanation of Solution

The standard cell potential is defined as the difference between the reduction cell potentials of two half-cells.

It can be expressed as follows:

  $E_{Cell}^{°}=E_{red}^{°}-E_{oxid}^{°}$

For example:

The cell reaction between aluminum and nickel is represented as follows:

  $\text{2Al}\left(s\right)+3{\text{Ni}}^{2+}\left(aq\right)\to 2{\text{Al}}^{3+}\left(aq\right)+3\text{Ni}(s)$

The standard cell potential for the reaction is $1.41\text{ V}$ .

Conclusion

The difference between reduction cell potentials determines the standard cell potential.