3463763244 - lectrochemical Methods of Analysis...

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Unformatted text preview: lectrochemical Methods of Analysis Electrochemical Methods of Analysis Potentiometric Methods of Analysis 1 4 008 Lecture # 7 1 11/04/2008 HW # 1 • n Page 35 On Page 535: Q1 • On Page 536: Q8 and 9 2 otentiometric Methods of Analysis Potentiometric Methods of Analysis • Potentiometric Measurements •- eference Electrodes I Reference Electrodes • II- Metallic Indicator Electrodes • III- Membrane Electrodes uantitative Applications • Quantitative Applications • Evaluation 3 4 Still no electrons flow under these conditions Potentiometric Electrochemical Cells • Anode: The electrode where oxidation occurs • Cathode: The electrode where reduction ccurs occurs • Salt Bridge: A connection between two solutions that allows movement of current the form of ionic charge. in the form of ionic charge. 5 Shorthand Notation for Electrochemical Cells • At the Anode: Zn (s) Zn 2+ (aq) + 2 e- • At the Cathode: g + q) + e- g(s) Ag (aq) + e Ag(s) n (s) + g + q) n 2+ q) + g(s) Zn (s) 2 Ag (aq) Zn (aq) 2 Ag(s) Zn(s) ZnCl (aq, 0.0167 M) AgNO (aq, 0.100 M) Ag(s) 6 ( ) 2 ( q, ) g 3 ( q, ) g ( ) otential and Concentration Potential and Concentration Ecell = Ec - Ea = ° RT E E- ln Q nF E = E °- ln Q 0.059 n 7 The Nernst Equation iquid Junction Potential Liquid Junction Potential • A potential that develops at the interface between two ionic solutions that differ in composition...
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3463763244 - lectrochemical Methods of Analysis...

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