Chem_208_25_07_web

Chem_208_25_07_web - Today 20.3-20.4 Thursday...

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1 Today: 20.3-20.4 Thursday: 20.5-20.7 (Skip 20.8)
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2 Standard Reduction Potential= E o for a reduction reaction at electrode at 25 o C. all solutes are 1.0 M, all gases at 1.0 bar. define the reduction potential of the standard hydrogen electrode (SHE) to be zero: 2H + (aq,1.0M) + 2e - H 2 (g,1.0 bar) E o = 0.00 V Other reduction potentials are determined by comparison to the SHE. tabulated for various electrodes (see text).
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3 Cell Potentials: When two standard half cells are connected together to form a galvanic cell (battery): reduction occurs in cell having larger (more positive) reduction potential (cathode) oxidation occurs in other cell (anode) The standard cell potential E o cell is given by: E o cell = E o (cathode) – E o (anode) >0 for galvanic cell.
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4 2H + (aq) + 2e - H 2 (g) E o = 0.000 V Cu 2+ (aq) + 2e - Cu(s) E o = 0.340 V E o cell = E o (cathode) – E o (anode) = 0.340 V – 0.00 V = 0.340V Oxidation- Anode Reduction- Cathode + - E o cell spontaneous Cu 2+ (aq) + 2e - Cu(s) H 2 (g) 2H + (aq) + 2e -
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Chem_208_25_07_web - Today 20.3-20.4 Thursday...

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