Paper spacer ВATTERY Zn2 (aq)2e Moist paste of ZnCl2 and NH4CI Layer of MnO2 Zn(s) Anode: Cathode 2NH (aq)2MnO2(s) + 2e" -= Mn2O3(s) 2NH3(aq) +H2O(I) Zn2 (aq) +2NH3(aq) H20(I)Mn2O3(s) Graphite cathode Overall: Zn(s) + 2NH (aq) + 2MnO2(s) Zine anode Figure 19.7 Interior section of a dry cell of the kind used in flashlights and transistor radios. Actually, the cell is not completely dry, as it contains a moist electrolyte paste. Cathode (steel) Zn(Hg)20H (aq) ZnO(s) H2O(l) + 2e Cathode: HgO(s) + H2O(l) + 2e >Hg() +20H (aq) Zn(Hg)HgO(s) ZnO(s) + Hg(/) Anode (Zn can) Insulation Anode: Overall: Removable cap Anode Cathode Electrolyte solution containing KOH and paste of Zn(OH)2 and HgO Figure 19.8 Interior section of a mercury battery HSO, electrolyte 3 PbSO4(s)2e Pb(s) SO(aq) PbSO&(s) 2H2O(I) Negative plates (lead grills filled with spongy lead) -> PbO2(s) 4H* (aq) + SO% (aq) + 2e Pb(s)PbO2(s) + 4H*(aq) 2SO (aq) Positive plates (lead grills filled with PhO) Overall: 2PBSO4(s) + 2H2O(/)

Paper spacer ВATTERY Zn2 (aq)2e Moist paste of ZnCl2 and NH4CI Layer of MnO2 Zn(s) Anode: Cathode 2NH (aq)2MnO2(s) + 2e" -= Mn2O3(s) 2NH3(aq) +H2O(I) Zn2 (aq) +2NH3(aq) H20(I)Mn2O3(s) Graphite cathode Overall: Zn(s) + 2NH (aq) + 2MnO2(s) Zine anode Figure 19.7 Interior section of a dry cell of the kind used in flashlights and transistor radios. Actually, the cell is not completely dry, as it contains a moist electrolyte paste. Cathode (steel) Zn(Hg)20H (aq) ZnO(s) H2O(l) + 2e Cathode: HgO(s) + H2O(l) + 2e >Hg() +20H (aq) Zn(Hg)HgO(s) ZnO(s) + Hg(/) Anode (Zn can) Insulation Anode: Overall: Removable cap Anode Cathode Electrolyte solution containing KOH and paste of Zn(OH)2 and HgO Figure 19.8 Interior section of a mercury battery HSO, electrolyte 3 PbSO4(s)2e Pb(s) SO(aq) PbSO&(s) 2H2O(I) Negative plates (lead grills filled with spongy lead) -> PbO2(s) 4H* (aq) + SO% (aq) + 2e Pb(s)PbO2(s) + 4H*(aq) 2SO (aq) Positive plates (lead grills filled with PhO) Overall: 2PBSO4(s) + 2H2O(/)

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter24: Coulometry

Section: Chapter Questions

Problem 24.4QAP: Halide ions can he deposited at a silver anode, the reaction being Ag(s) + X- AgX(s) +e- Suppose...

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