1. e- I >0
COM
A
e- e-
I
NH4+ NO3-
Cu2+(aq) + 2 e- = Cu(s)
2 Cu(s)
Zn(s) = Zn2+(aq) + 2 e-
Zn(s) 2+
(aq)
- +
oxydation réduction
2 e- 2 e-
Cu(s)
Zn(s)
Zn(s) Zn2+(aq) Cu(s) Cu 2+
I
Zn2+ (aq) + SO42- (aq) Cu2+ (aq) + SO42- (aq)