Chem_215_Lect_26_Color - Balancing Redox Reactions Two...

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1 Balancing Redox Reactions • Two Methods: – The oxidation states method: • Specify all oxidation states of atoms in reaction. • Identify element being oxidized and being reduced. • Determine number of e - involved in oxid’n and red’n. • Multiply by constants to balance e - flow. • Balance rest of equation by inspection. – The half-reaction method:
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2 Balancing Redox Reactions in Acid Solutions
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3 Balancing Redox Reactions in Basic Solutions
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4 Dry Cell Battery Oxidation: Zn(s) Zn 2+ + 2e - Reduction: 2MnO 2 (s) + H 2 O(l) +2e - Mn 2 O 3 (s) + 2OH - E cell = 1.55 V
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5 Lead-Acid Storage Battery Oxid’n: Pb(s) + HSO 4 - (aq) PbSO 4 (s) + H + + 2e - Red’n: PbO 2 (s) + 3H + +HSO 4 - + 2e - PbSO 4 (s) +2H 2 O(l) E cell = 1.74V – (-0.28V) = 2.02 V
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6 Fuel Cells Anode: 2{H 2 (g) + 2OH - (aq) 2H 2 O(l) + 2e - } Cathode: O 2 (g) + 2H 2 O(l) + 4e - 4OH - (aq) Overall: 2H 2 (g) + O 2 (g) 2H 2 O(l) E 0 cell = 1.229V
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7 Corrosion
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8 Chapter 15: Kinetics Questions: How rapidly does a reaction proceed?
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Chem_215_Lect_26_Color - Balancing Redox Reactions Two...

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