Lec11_drobny_11 - Lecture 11: Cell Potentials! ! Reading:...

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Lecture 11: Cell Potentials • Reading: Zumdahl 11.2 • Recommended Problems:11.15,11.17,11.19 11.21 • Outline – Redox Review – What is a cell potential? – SHE, the electrochemical zero. – Using standard reduction potentials.
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Galvanic Cells • In redox reaction, electrons are transferred from the oxidized species to the reduced species. • Imagine separating the two 1/2 cells physically, then providing a conduit through which the electrons travel from one cell to the other. Porous Cap
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Galvanic Cells (cont.) Cu Cu 2+ + 2e - Ag + + e - Ag x 2 Cu 2+ (aq) Cu Ag + (aq) Ag e - e -
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Galvanic Cells (cont.) Anode: Electrons are lost Oxidation Cathode: Electrons are gained Reduction
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• In a galvanic cell, a species is oxidized at the anode, a another species is reduced at the cathode, with electrons fowing From anode to cathode. This electron current can do work: w=-qE cell where q is the charge transFerred From anode to cathode. • The Force on the electrons causing them to Full is reFerred to as the electromotive Force E cell (EM±). The unit used to quantiFy this Force is the volt (V)
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Lec11_drobny_11 - Lecture 11: Cell Potentials! ! Reading:...

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