Extra Credit:

Assume a system where Cu2+/Cu has an electrode potential of 0.34 V vs. SHE, and H2/H2O has an electrode potential of -0.41 V vs SHE at pH = 7. The typical onset overpotential of water reduction to H2 is -0.8 V (onset means that there is appreciable current). Include both cathodic and anodic processes. Hint: For H2/H2O, H2 will escape the system immediately after it is generated. Take this into account.

Qualitatively draw a cyclic voltammetry schematic of Zn2+/Zn protected by N2 gas when the electrode potential is swept between -1.5 and 0.5 V vs. SHE.