1
st
you need the BALANCED
EQUATION
•
Pb
2+
+ 2 e-
Ú
Pb
(s)
E
0
red
= -0.13 V
•
Cu
2+
+ 2 e-
Ú
Cu
(s)
E
0
red
= 0.34 V
•
•
You need an OXIDATION and a
REDUCTION.
•
E
0
cell
>0 or nothing happens!