1. salt bridge
(K+) Cation flow →
(Cl-) flow ←

2. Zn Cu

3. Brief Activity Series

4. Strong Reducing Agent.

5. Strong Oxidizing Agent

7. How many moles of Cu can be plated out of a solution containing Cu2+ ions if a 1.50 amp current is passed through for 300 s?
RXN:
Cu e- → Cu(s)
Notes: 1 amp = C/s F = 9.65 x 104 c/ mole e-
Find: c → moles e-s → moles Cu
1.50 c s
300 s
mole e-
9.65 x 104 C
1 mole Cu
2 mole e-s
= moles Cu
2.33 x 10-3

8. Dividing by –nF gives Rise to the Nerst Equation.
Effect of Concentration on EMF
A Battery going dead.
∆G = ∆Go + RT lnQ
-nFE = -nFEo + RT ln Q
Dividing by –nF gives Rise to the Nerst Equation.

9. The Nerst Equation:
Q: aA + bB ↔ cC + dD
n = # of e- s transferred

10. The Nerst Equation allows us to find voltage under nonstandard conditions
Example:
Determine E (voltage) for: Fe(s) + Cd2+(aq) → Fe2+(aq) Cd(s)
When [Fe2+] = 0.10 M and [Cd2+] = 1.0 M @ 298K
Half RXNs: Fe(s) → Fe e Eo = V
Cd e- → Cd(s) Eo = V
Eo = V
+ Value means spontaneous

11. Now try: [Fe2+] = 1.0 M and [Cd2+] = 0.01 M @ 298K
- Value means non spontaneous and will go in opposite direction

12. What does an E = 0 value mean?
For: Fe(s) + Cd2+(aq) → Fe2+(aq) Cd(s) Eo = +0.04V
K = 22