CHE134 Summer Lecture 11

CHE134 Summer Lecture 11 - ELECTROCHEMISTRY AND THE NERNST...

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ELECTROCHEMISTRY AND THE NERNST EQUATION
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OBJECTIVES: STUDY RELATIONSHIP BETWEEN CHEMISTRY AND ELECTRICAL ENERGY QUANTITATIVE STUDY OF CHEMICAL REACTIONS BY ELECTROCHEMICAL CELLS
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BACKGROUND AN ELECTOCHEMICAL CELL INVOLVES A FLOW OF ELECTRON WHICH IS ACCOMPLISHED BY OXIDATION-REDUCTION REACTIONS. THESE REACTION CAN BE WRITTEN AS HALF REACTIONS: OXIDATION - LOSS OF ELECTRONS Cu(s) 2+ + 2e- REDUCTION - GAIN OF ELECTRONS 2Ag+(aq) + 2e- & 2Ag(s)
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NET REACTION: ELECTRONS LOST EQUAL TO ELECTRONS GAIN 2Ag+(aq) + Cu(s) F Cu2+ + 2Ag(s) IN AN ELECTROCHEMICAL CELL, HALF REACTIONS ARE CARRIED OUT IN SEPARATE COMPARTMENTS CALLED HALF CELLS AS SHOWN
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Click to edit Master subtitle style AN ELECTROCHEMICAL CELL Cu2+ + 2e- 7 2 Cu [Zn2+] R [Cu2+]L 2 Zn → Zn 2+ + 2e- Salt bridge Anode Cathode Zinc→ ←Copper
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Cu (s) + 2Ag+ (aq) 2Ag (s) + Cu2+ (aq) A. True B. False The function of the salt bridge is to provide a path for electrons to flow between half cells, thereby maintaining electro-neutrality. 6
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Cu (s) + 2Ag+ (aq) 2Ag (s) + Cu2+ (aq) B. False The function of the salt bridge is to provide a path for electrons to flow between half cells, thereby maintaining electro-neutrality. 7 A salt bridge permits cations and anions to flow into half cells to maintain electro- neutrality. E.g., cations into the cathode compartment where reduction occurs
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AN ELECTROCHEMICAL CELL ANODE COMPARTMENT CATHODE COMPARTMENT SALT BRIDGE TO ALLOW FLOW OF IONS TO NEUTRALIZE CHARGE IN CELL AN EXTERNAL CONNECTION FOR FLOW OF ELECTRONS.
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SHORTHAND DESCRIPTION OF ELECTROCHEMICAL CELL Zn(s) & Zn+2 ]& ANODE CATHODE AT THE ANODE COMPARTMENT Zn (s) IS OXIDIZED
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This note was uploaded on 01/09/2011 for the course CHE 134 taught by Professor Staff during the Summer '08 term at SUNY Stony Brook.

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CHE134 Summer Lecture 11 - ELECTROCHEMISTRY AND THE NERNST...

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