Page 13 - Pharmaceutical Analytical Chemistry II - Pharm D- 02-06-07102

It will behave spontaneously as Anode when the cell is
discharging,

The spontaneously reaction is OXIDATION

Cd(s) Cd2+ + 2e─

Acts as reducing agent, stronger reductant than H+

Cell reaction: Cd(s) + 2H+ Cd2+ + H2(g)

SHE acts as Cathode

What does the Magnitude of Standard

Electrode potential, E0 imply?

E0F2/F- = + 2.87 V
E0Ag+/Ag = + 0.799 V

E0H2/H+ = 0.000 V
E0Cd2+/Cd = - 0.403 V

E0Li+/Li = - 3.04 V

The more positive E0red the stronger the oxidizing agent
The more negative E0red the stronger the reducing agent

What does the sign of the Cell
Potential imly?? -IUPAC sign convention

Consider the following cell:

CuCu2+ (0.02 M)  Ag+ (0.02 M)  Ag

According to the schematic presentation:
Ecell = EAg ─ ECu

12