Saved Bookmarks
| 1. |
Mention the reactions occuring at (i) anode (ii) cathode , during working of a mercury cell. Why does the voltage of a mercury cell remain constant during its operation? |
|
Answer» Solution :Working of mercury cell: Anode: `Zn(Hg)+2OH^(-) to ZnO(s)+H_2O(l)+2e^(-)` (Amalgam) Cathode: `HgO(s)+H_2O(l)+2e^(-) to Hg(l)+2OH^(-)` Net REACTION: `Zn(Hg)+HgO(s) to ZnO(s)+Hg(l)` AMalgam The operating voltage for mercury cell is 1.35 V and show consistancy throughout its life as the overall reaction does not involve any ION in solution WHOSE CONCENTRATION can change during its life time. |
|