Gen Chem electrochemistry

Gen Chem electrochemistry - #91 Notes Unit 11:...

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chemistrynoteslecture.com LLC © 2011 #91 Notes Unit 11: Electrochemistry and Radiochemistry Ch. Electrochemistry and Radiochemistry I. Galvanic Cells Zn (s) + Cu 2+ (aq) → Zn 2+ (aq) + Cu (s) Zn (s) → Zn 2+ (aq) + 2 e - oxidizing Cu 2+ (aq) + 2 e - Cu (s) reducing O xidized R educed A n ode ( - ) C a t hode ( + ) The salt bridge adds ions to keep the solutions balanced: (-) ions are added to (+) ions are added to balance the arriving replace the departing Zn 2+ (+) ions. Cu 2+ (+) ions. ** or cells separated by porous disk Cell potential = el ectromotive force (emf) = ε cell From Reduction Potential Table: Zn 2+ (aq) + 2 e - Zn (s) -0.76 v Cu 2+ (aq) + 2 e - Cu (s) 0.34 v Zn (s) → Zn 2+ (aq) + 2 e - +0.76 v Cu 2+ (aq) + 2 e - Cu (s) 0.34 v Zn (s) + Cu 2+ (aq) → Zn 2+ (aq) + Cu (s) 1.10 v (+) is spontaneous
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chemistrynoteslecture.com LLC © 2011 ** If given 2 reduction potentials, make the reaction spontaneous. (flip one of them) The reduction potentials are arbitrary. They are standardized on
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This note was uploaded on 09/04/2011 for the course CHM 2046 taught by Professor Haces during the Spring '11 term at FAU.

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Gen Chem electrochemistry - #91 Notes Unit 11:...

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