question_answer 40)

Depict the galvanic cell in which \[Zn(s)+2A{{g}^{+}}\to Z{{n}^{2+}}(aq)+2Ag(s)\]takes place. Further show: (i) Which electrode is negatively charged? (ii) Carriers of current in the cell. (iii) Individual reaction at each electrode.  

Answer:

(i) \[\underset{Anode}{\mathop{Zn(s)|Z{{n}^{2+}}}}\,||\underset{Cathode}{\mathop{A{{g}^{+}}|Ag(s)}}\,\] Oxidation takes place at anode and reduction at cathode. (ii) Electrons (iii) \[Zn(s)\to Z{{n}^{2+}}+2{{e}^{-}}\](Anode) \[C{{u}^{2+}}+2e\to Cu(s)\] (Cathode)