(a) The cell in Figure 17-4 is: Cu(s) |1.0 M CuSO₄(aq) A KCl (aq, 3 M) | AgCl(s) | Ag(s) Write half-reactions for this cell. Neglecting activity coefficients and the junction potential between CuSO₄(aq) and KCl (aq), predict the equilibrium (zero-current) voltage expected when the Luggin capillary contacts the Cu electrode. For this purpose, suppose that the reference electrode potential is 0.197 V vs. S.H.E. Why is the observed equilibrium potential 1109 mV, not the value you calculated?
(b) How would the overpotentials change if .1.000 V were imposed by the potentiostat?

Figure 17-4

Transcribed Image Text:

Potentiostat 1.000 V V Potentiometer Ag | AgCI | KCI reference electrode -1.0 M CuSO, in syringe barrel Porous plug at base of electrode Cu 1.0 M CusO, -Luggin capillary d (cm) 15 cm Anode Cathode