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421-821-chapter-24

421-821-chapter-24 - Coulometric Methods A Introduction 1...

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A.) Introduction : 1.) Coulometry: electrochemical method based on the quantitative oxidation or reduction of analyte - measure amount of analyte by measuring amount of current and time required to complete reaction e ° charge = current (i) x time in coulombs - electrolytic method external power added to system 2.) Example: - Coulometric Titration of Cl - Coulometric Methods
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3.) Based on Measurement of Amount of Electricity (or charge, in coulombs) Required to Convert Analyte to Different Oxidation State - Q = It for constant current with time where: 0 t
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Example 19 : Constant current of 0.800 A (amps.) used to deposit Cu at the cathode and O 2 at anode of an electrolytic cell for 15.2 minutes. What quantity in grams is formed for each product?
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4.) Two Types of Coulometric Methods a) amperostatic (coulmetric titration) - most common of two b) potentiostatic Fundamental requirement for both methods is 100% current efficiency - all e - go to participate in the desired electrochemical process - If not, then takes more current
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