Electrolysis - Electrolysis Process of driving a reaction...

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1 Electrochem Slide 41 Electrolysis Process of driving a reaction in a non-spontaneous direction by using an electric current; done using an electrolytic cell ; Two things need to be considered: the voltage the power supply or galvanic cell provides and the current at which it is provided. Voltage is the amount of energy provided for electrolysis while Current is the rate (or speed) at which it is provided; The voltage tells you what will happen and the current tells you how long it will take Current : ( I ) amount of charge ( Q ) that flows thru an electric circuit in a given amount of time ( t ); measured in coulombs per sec or amperes (A) Overpotential: the “extra” voltage needed to carry out a given electrolysis Electrochem Slide 42 Comparison of Galvanic and Electrolytic cells VOLTAIC CELL ELECTROLYTIC CELL Reduction half-reaction Y + + e - Y Oxidation half-reaction X X + + e - System does work on its surroundings Reduction half-reaction B + + e - B Oxidation half-reaction A - A + e - Surroundings(power supply) do work on system(cell) Overall (cell) reaction X + Y + X + + Y; G < 0 Overall (cell) reaction A - + B + A + B; G > 0
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2 Electrochem Slide 43 Predicting Electrolysis Products: Aqueous Ionic Solutions For the cathode: The two reactions we have to consider are: The reduction of K + is a higher potential so H 2 ( g ) is the PRIMARY product at the cathode ( regardless of voltage supplied! ).
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This note was uploaded on 04/06/2008 for the course CHEM 6 taught by Professor Bernoililes during the Spring '08 term at UCSD.

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Electrolysis - Electrolysis Process of driving a reaction...

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