B only Please!! Thank you, Cu(s) 1.0 M CuSO (a) KCl (aq, 3 M) | AgCl(s) Ag(s) Wr

Question

B only Please!! Thank you,

Cu(s) 1.0 M CuSO (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, sup- pose that the reference electrode potential is 0.197 V vs. S.H.E. Why is the observed equilibrium potential +109 mV, not the value you calculated? (b) How would the overpotentials change if >1.000 V were imposed by the potentiostat?

Explanation / Answer

Overpotential:Some extra voltage for potential required then the theoretical value of the standard electrode potential of a reaction is called over voltage or overpotential.

For Electrolytic cell:Overpotential is directly related to a cell's voltage efficiency.

For electrolytic cell if overpotential is observed it implies that the cell requires more energy than thermodynamically expected to drive a electrolytic reaction.

For a Galvnic cell if the overpotential is oserved means less energy is recovered than predicted by Thermodynamics. In each case the extra/missing energy is lost as Heat.

Overpotential is  increases with growing current density.

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