Difference cell cell emf standard reduction potential

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Unformatted text preview: um work that an electron can do is equal to its charge times the difference in electrical potential though which it falls. difference Cell Cell EMF ° Standard reduction potential ( Ered ) : the voltage associated with a reduction reduction reaction at an electrode when all solutes present at 1 M solutes and all gases at 1 atm. gases atm ° Standard potential ( Ered ) : a measure electronmeasure of electron-pulling power of a single electrode ° Zn 2+ (aq) + 2e → Zn( s ) EZn2+ / Zn = −0.76V ° Cu 2+ (aq) + 2e → Cu ( s ) ECu 2+ / Cu = +0.34V ° ° ° Ecell = Ecathode − Eanode In a voltaic cell, the electrodes pulling in opposite directions, so the cell overall pulling power of a cell, the cell standard EMF, is the difference of the standard potential of two electrodes. Standard Electrode Potentials The reference half reaction: the reduction of H+(aq) to the H2 (g) under standard conditions. standard Reduction Reaction 2 H + (aq,1M ) + 2e → H 2 ( g ,1atm) Standard condition ° Ered ( H + / H 2 ) = 0V Standard hydrogen electrode (SHE) redox couple Standard Electrode Potentials Standard Reduction Potentials (E°red ) is measured relative to the is standard hydrogen electrode (SHE). The standard emf (E° ) of the cell cell ° ° ° Ecell = Ecathode − Eanode ° Ecell = 0.76V (-)Zn (s) | Zn2+ (1 M)...
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This document was uploaded on 02/26/2014.

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