Chapter 19, Problem 19.102QP

(a)

Interpretation Introduction

Interpretation:

The sign for the standard reduction potential of the given half cells has to be found and the standard cell potential of the given cell has to be calculated.

Concept Introduction:

Redox reactions are the reactions in which both oxidation and reduction takes place simultaneously.  Oxidation is the removal electron from an atom or ion.  Oxidation process increases the oxidation number.  Reduction is the addition of electron to an atom or ion.  Reduction process decreases the oxidation number.  The electrochemical reaction of zinc with copper sulphate is an example of redox reaction.

  ${\text{Zn}}_{\text{(s)}}{\text{ + CuSO}}_{\text{4}}{}_{\text{(aq)}}\to {\text{ZnSO}}_{\text{4}}{\text{+ Cu}}_{\text{(s)}}$

Standard reduction potential is the measure of the tendency of a species to undergo reduction.  It is measured in terms of volts.  The substance which is having high positive value will easily undergo reduction.  In electrochemical series, the elements are arranged in the decreasing order of reduction potential.

The standard electrode potential of a cell ${\text{(E}}^{°}{}_{\text{cell}})$ is the difference in electrode potential of the cathode and anode.

  ${\text{E}}^{\text{°}}{}_{\text{cell}}={\text{E}}^{\text{°}}{}_{\text{cathode}}-{\text{E}}^{\text{°}}{}_{\text{anode}}$

(b)

Interpretation Introduction

Interpretation:

The sign for the standard reduction potential of the given half cells has to be found and the standard cell potential of the given cell has to be calculated.

Concept Introduction:

Redox reactions are the reactions in which both oxidation and reduction takes place simultaneously.  Oxidation is the removal electron from an atom or ion.  Oxidation process increases the oxidation number.  Reduction is the addition of electron to an atom or ion.  Reduction process decreases the oxidation number.  The electrochemical reaction of zinc with copper sulphate is an example of redox reaction.

  ${\text{Zn}}_{\text{(s)}}{\text{ + CuSO}}_{\text{4}}{}_{\text{(aq)}}\to {\text{ZnSO}}_{\text{4}}{\text{+ Cu}}_{\text{(s)}}$

Standard reduction potential is the measure of the tendency of a species to undergo reduction.  It is measured in terms of volts.  The substance which is having high positive value will easily undergo reduction.  In electrochemical series, the elements are arranged in the decreasing order of reduction potential.

The standard electrode potential of a cell ${\text{(E}}^{°}{}_{\text{cell}})$ is the difference in electrode potential of the cathode and anode.

  ${\text{E}}^{\text{°}}{}_{\text{cell}}={\text{E}}^{\text{°}}{}_{\text{cathode}}-{\text{E}}^{\text{°}}{}_{\text{anode}}$