Lecture 18

# Lecture 18 - -5 M I 3-at pH 10.00 with PH2 fixed at 1.00...

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Chapter 17 Electroanalytical Techniques Fundamentals of electrolysis Working Electrode: Counter Electrode: Current is positive when a reduction reaction occurs the working Electrode Current measures the rate of Reaction

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Example: If a current of 0.17 A flows for 16 min through the cell left, how many grams of Cu(s) will be deposited?
Voltage changes when current flows ~0A I 0 A When I > 0 A, E = E (cathode) –E (anode) Overpotential is the voltage required to overcome the activation energy to force the reaction occur

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Example: to electrolyze I - to I 3 - in a 0.10 M KI solution containing 3.0 x 10

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Unformatted text preview: -5 M I 3-at pH 10.00 with PH2 fixed at 1.00 bar. 3I-+ 2H 2 O I 3-+ H 2 (g) +2OH-(a) Find the cell voltage if no current is flowing. (b) then suppose electrolysis Increase the [I 3-]s to 3.0 x 10-4 M, but other concentrations are unaffected. Suppose cell resistance is 2.0 ohms and current is 63 mA the cathode overpotential is 0.382 V and the anode overpotential is 0.025 V. What voltage needed to drive this reaction? is needed to drive this reaction? Electrogravimetric Analysis Coulometry Amperometry Homework: 17-1; 17-4; 17-8; 17-9; 17-12; and 17-15....
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## This note was uploaded on 09/10/2009 for the course CHM 3120 taught by Professor Harrison during the Spring '08 term at University of Florida.

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Lecture 18 - -5 M I 3-at pH 10.00 with PH2 fixed at 1.00...

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