At cathode: Silver ions have lower discharge potential than hydrogen ions. Hence, silver ions will be deposited in preference to hydrogen ions.
At anode: Silver anode will dissolve to form silver ions in the solution.
Ag→Ag++e−(ii) An aqueous solution of AgNO3 with platinum electrodes.
At cathode: Silver ions have lower discharge potential than hydrogen ions. Hence, silver ions will be deposited in preference to hydrogen ions.
At anode: Hydroxide ions having lower discharge potential will be discharged in preference to nitrate ions. Hydroxide ions will decompose to give oxygen.
4OH−(aq)→2H2O(l)+O2(g)+4e−
(iii) A dilute solution of H2SO4 with platinum electrodes.
At cathode: 2H++2e−→H2(g)
At anode: Hydroxide ions having lower discharge potential will be discharged in preference to sulphate ions. Hydroxide ions will decompose to give oxygen.
4OH−(aq)→2H2O(l)+O2(g)+4e−
(iv) An aqueous solution of CuCl2 with platinum electrodes
At cathode: Cupric ions will be reduced in preference to protons
Cu2++2e−→Cu
At anode: Chloride ions will be oxidized in preference to hydroxide ions
2Cl−→Cl2+2e−