Advance Study Assignment: Voltaic Cell Measurements I. A student measures the po

Question

Advance Study Assignment: Voltaic Cell Measurements I. A student measures the potential of a cell made up with l M cuso, in one solution reservoir and M ZnSO4 in the other. There is a metallic in the cuso. zinc copper (cuo) electrode electrode in the znso, and the cell i set up as shown in Figure 32.1.She finds that the potential, or volt age, of the cell, E is 1.016v, and that the Zn electrode is negative. a. At which electrode is oxidation occuning? b. Write the equation for the oxidation halfreaction in this cell. c. Write the equation for the reduction half-reaction in this cell. d. Write the net ionic equation for the spontaneous oxidation-reduction reaction that occurs in this cell 2. In another cell, the potential of the c metal. copperan ion electrode was found to be 0.442 V rela- tive to a silver metal, silver ion electrode. with the copper electrode being negative. a. If the potential of the silver, silver ion electrode, Er is taken to be 0.000 V in oxidation or reduction, what is the value of the potential for the oxidation reaction Ec cua End b. equals +0.799v, as in standard tables of electrode potentials, what is the value of the As red Ee potential of the oxidation reaction of copper, volts c. The student adds 6 M NH, to the Cusoa solution in this second cell until the Cu ion is essentially all converted to Cu(NH, ion. The voltage of the cell. Ea goes up to 0.917Vand the Cu electrode is still negative. Find the residual concentration ofCu ion in the cell. (Use Eq. 4) (continued on following page)

Explanation / Answer

(1)

(a) Since Zn is assigned negative it acts as anode and undergoes oxidation by leaving electrons on the surface of electrode itself. (because of it only it is assigned negative)

(b) Oxidation Half Reaction:

Zn (s) ------------> Zn2+ (aq.) + 2 e-

(c) Reduction Half Reaction:

Cu2+ (aq.) + 2 e- -----------> Cu (s)

(d) Net Cell Reaction:

Zn (s) + Cu2+ (aq.) -----------> Zn2+ (aq.) + Cu (s)

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