Lec-35-Chap19-5-Complete

Lec-35-Chap19-5-Complete - Lec-35-Chap15-5-Complete...

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Lec-35-Chap15-5-Complete 11/23/2009 Electrochemical Cells. Concentration Effects. Equilibrium constants 1 Lec-35: Electrochemistry and its Applications Chapter 19 1 Relation of cell emf to Thermodynamics 0 cell C 96485 mol G F nF E    In summary: el e e le ct ctri rost cal wo atic potential differen c rk c e e harg V q w reversible process max Gw For a cell reaction in which n electrons are exchanged       0 A cell 0 l V cel O V E G G G E eN F q n n      2
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Lec-35-Chap15-5-Complete 11/23/2009 Electrochemical Cells. Concentration Effects. Equilibrium constants 2 Relation to Thermodynamics For an electrochemical cell based on a redox reaction with equilibrium constant , and in which n electrons are exchanged 0 cell ln G nF E G RT K      from which it follows that 0 00 cell G RT EK nF nF Taking into account that                 10 10 1 log ; ln ln 0 ln 10 ln log log 2. ln 302 a a xx x x x x a a  3 Relation to Thermodynamics we have         0 0 0 0 cell cell J 2.302 8.314 298K 2.302 K mol log log C 96485 mol 0.0592V log RT n K nF n    4
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Lec-35-Chap15-5-Complete 11/23/2009 Electrochemical Cells. Concentration Effects. Equilibrium constants 3 Relation to Thermodynamics Calculate the equilibrium constant of the reaction         24 2 I s Sn aq 2I aq Sn aq  We have the half-reactions         2 I s 2 2I a Sn aq Sn aq 2 q e e   The corresponding reduction potentials are     2 42 I / I 0.535V Sn / Sn 0.15V E E 5 Table 19-1a, p.926 6
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Lec-35-Chap15-5-Complete 11/23/2009 Electrochemical Cells. Concentration Effects. Equilibrium constants 4 Table 19-1b, p.927 7 From the relation   0 cell 0.0592V log EK n  Relation to Thermodynamics The electromotive force of the cell in standard conditions is     0 cell 0 cell 0 cel 0 0 cathod anod e e 2 l 42 I/ Sn / Sn 0.15 I 0.535V 0.3 5V V 8 E E E E E E E   we find
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This note was uploaded on 01/05/2010 for the course CHE 132 taught by Professor Hanson during the Fall '08 term at SUNY Stony Brook.

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Lec-35-Chap19-5-Complete - Lec-35-Chap15-5-Complete...

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