Lec-36-Cap19-6-b

Lec-36-Cap19-6-b - Lec-36-Chap19-6-b 11/23/2009 Lec-36:...

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Lec-36-Chap19-6-b 11/23/2009 Voltaic Cells in Non-Standard Conditions. Electrolysis 1 Lec-36: Electrochemistry and its Applications Chapter 19 1                   2 2 3 3 2 2 red anode ox 3 2 3 2 2 3 0.0V 2H O H g,1bar 2H O aq, 2 2H O aq, 2 2H O H g,1bar 0.0592 As a reductio V 1 H O / H H O / H lo n g 2 HO x x x Ce E E E E     Measurement of pH Consider the following electrochemical cell             3 23 acid solution of unknown concentration standard 2 standard hydrogen electrode Pt s |H g,1bar |H O aq, aq,C |H g,1bar |Pt C s || x 2
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Lec-36-Chap19-6-b 11/23/2009 Voltaic Cells in Non-Standard Conditions. Electrolysis 2           cell cathode anode red red cell red ox 2 red red cell red ox 3 2 0.0V 3 c l e e ll 3 cl 0.0592V 0.0592V 1 log log H O 22 HO 0.0592V log H O 0.0 0.05 592V p 92V pH H x x x E E E E E E E E E E E        Measurement of pH Consider the following electrochemical cell             3 23 acid solution of unknown concentration standard 2 standard hydrogen electrode Pt s |H g,1bar |H O aq, aq,C |H g,1bar |Pt C s || x 3 Electrolysis Electrons are forced into the electrochemical system from an external power source (a battery) so that an unfavorable reaction takes place. Like in voltaic cells, electrolysis cells have two electrodes connected externally to a power source. A simple example is the electrolysis of a molten salt. 4
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Lec-36-Chap19-6-b 11/23/2009 Voltaic Cells in Non-Standard Conditions. Electrolysis 3 reduction, cathode negative, cations migrate to it    oxidation, anode positive, anions migrate to it 5 Electrolysis Electrons are forced into the electrochemical system from an external power source (a battery) so that an unfavorable reaction takes place.
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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-36-Cap19-6-b - Lec-36-Chap19-6-b 11/23/2009 Lec-36:...

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