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REDOX & Electrochemistry - LSU Chemistry

REDOX & Electrochemistry - LSU Chemistry

REDOX

REDOX 34Alkaline CellsGraphiteCathodeMoist Pasteof KOH,MnO 2 &graphitePorousseparatorZinc anodeThe simple replacement ofNH 4 Cl electrolyte with aKOH gel eliminates theproduction of the problematicNH 3 gas that occurs in theregular dry cell. This batteryhas much improved stabilityfor delivering electricalcurrent until all the reagentsare used up.Anode Rxn:Zn + 2OH − Zn(OH) 2 + 2e-Cathode Rxn:2MnO 2 + 2H 2 O2MnO(OH) + 2OH −Overall Rxn:Zn + 2MnO 2 + H 2 O 2MnO(OH) + Zn(OH) 2Eº = 1.5 V

REDOX 35Corrosion of Steel/IronO 2CathodeFe 2+ Fe 2+ O 2WaterSteelAnodeCathode: ½O 2 + H 2 O + 2e-Anode: Fe Fe 2+ + 2e-2OH −Sum: ½O 2 + Fe + H 2 O Fe(OH) 2Subsequent Redox rxn:4Fe(OH) 2 + O 2 + 4OH −RUST2Fe 2 O 3 • 4H 2 OThe presence of NaCl (salt) in the water makes it moreconductive to e- flow, making it easier for the O 2to oxidize theiron without having to come directly in contact with it.Instead it can react anywhere at the surface of the water drop.

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