Lec 6 - BIBC 102 Winter 2007 Lecture 6 January 22, 2007...

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BIBC 102 Winter 2007 Lecture 6 January 22, 2007
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From inorganic chemistry: 1) Fe +3 + e - Fe +2 a reduction reaction 2) Cu +1 Cu +2 + e - an oxidation reaction 3) Fe +3 + Cu +1 + e - Fe +2 + Cu +2 + e - Reactions 1 and 2 are half reactions
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1) pyruvate + 2e - + 2H + lactate 2) NAD + + 2e - + H + NADH
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LNC Fig. 13.14 With an apparatus such as this one one can measure STANDARD REDUCTION POTENTIALS relative to a reference cell with hydrogen ions and hydrogen gas under standard conditions
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1) pyruvate + 2e - + 2H + lactate E’ o = - 0.185 volts 2) NAD + + 2e - + H + NADH E’ o = - 0.320 volts reversing reaction 3 also reverses the standard reduction potential 3) NADH NAD + + 2e - + H + E’ o = + 0.320 volts adding reactions 1 and 3: pyruvate + NADH + H + lactate + NAD + E’ o = + 0.135 volts 2200 G’ o = - n F E’ o = - 2 ( 96.5 kJ/V.mol) (+0.135 volts) = - 23.7 kJ/mol n is the number of electrons involved in the redox reaction Note the correction from the lecture
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This note was uploaded on 02/25/2010 for the course BIBC na taught by Professor Schfler during the Spring '10 term at UCSD.

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Lec 6 - BIBC 102 Winter 2007 Lecture 6 January 22, 2007...

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