Instrumental Lecture 20B Electrochem

Instrumental Lecture 20B Electrochem - Chapter 22...

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Chapter 22: Introduction to Electroanalytical Chemistry Two general categories: 1) Potentiometric Systems – measure voltage (i.e., potential) of a galvanic cell (produces electricity spontaneously) 2) Voltammetric Systems – control potential & usually measure current in an electrolytic cell (consumes power to cause an electrochemical reaction to occur)
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Potentiometry Determine concentrations by measuring the potential (i.e., voltage) of an electrochemical cell (galvanic cell) Two electrodes are required 1) Indicator Electrode – potential responds to activity of species of interest 2) Reference Electrode – chosen so that its potential is independent of solution composition.
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Representation of Electrochemical Cell Salt Bridge For ion transfer Anode
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