Question
Depict the galvanic cell in which the reaction Zn(s) + 2Ag+ (aq) → Zn2+(aq) +2Ag(s)
takes place, Further show:
(i) which of the electrode is negatively charged,
(ii) the carriers of the current in the cell, and
(iii) individual reaction at each electrode.
Solution
The galvanic cell will be
Zn (s),Zn2+ (aq)// Ag+ (aq), Ag (s)
i)The Zn electrode will be negatively charged.
ii) Current will flow from silver electrode to zinc electrode.
Electrons flow from Zn to Cu outside ions carry current in the cell.
iii) Individual reaction at each electrode will be
At anode: Oxidation half reaction
Zn(s) -> Zn2+ +2e-
At cathode: Reduction half reaction
2Ag+ (Aq) +2e- -> 2Ag(s)
