Nernstlecture_144-1

Nernstlecture_144-1 - 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) Cu 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) Cu2+ + 2Ag(s) IN AN ELECTROCHEMICAL CELL, HALF REACTIONS ARE CARRIED OUT IN SEPARATE COMPARTMENTS CALLED HALF CELLS AS SHOWN
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AN ELECTROCHEMICAL CELL Cu 2+ + 2e - 2 Cu [Zn 2+ ] R [Cu 2+ ] L 2 Zn → Zn 2+ + 2e- Salt bridge Anode Cathode Zinc→ ←Copper
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Cu (s) + 2Ag + (aq) 2Ag (s) + Cu 2+ (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) + Cu 2+ (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 HAS 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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Nernstlecture_144-1 - ELECTROCHEMISTRY AND THE NERNST...

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