Question

Predict Whether
Ag⁺ can oxidize Pb to Pb²⁺ under standard state conditions.
E°Ag= 0.799 V and E°Pb = -0.126 V.

Answer 1

Net reaction of a voltaic cell constructed from a standard zinc electrode and a standard copper electrode is obtained by adding the two half-reactions together and half-reactions must be reversed to yield an oxidation.

oxidation  Zn(s)Zn2+(aq) + 2e–  

reduction  2 [ 1 e– + Ag+(aq)  Ag (s) ]  

net  Zn(s) + 2 Ag+(aq)  2 Ag(s) + Zn2+(aq)