Suppose you set up electrochemical cell to initiate Cu deposition on an inert no

Question

Suppose you set up electrochemical cell to initiate Cu deposition on an inert noble metal (e.g. Pt) cathode. Assuming that the counter-electrode reaction is the evolution of O2 gas from water, also at a Pt surface, a .010M CuSO4 solution is used as the copper source in the working electrode compartment and 0.050M KHP is used as the electrolyte medium in the counter-electrode compartment:

a. Show the line diagram of the complete electrochemical cell.

b. Write the 2 half-cell reactions and corresponding Nernst expressions with SRPs.

c. Assuming O2 gas is being evolved at 390 Torr in the counter-electrode compartment and given the other cell conditions as above, compute the 2 half-cell potentials.

d. Express the above potentials on the SCE reference scale.

e. Compute the cell voltage.

Explanation / Answer

Anode 2H20 --> O2 + 4H+ + 4e

Cathode Cu+ + e --> Cu

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