Chapter-15-Notes

Chapter-15-Notes - Chapter 15 Electrodes and Potentiometry...

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Chapter 15 Electrodes and Potentiometry page 1 Ch. 15 Electrodes and Potentiometry In potentiometry , electrodes are used to measure voltages that provide chemical information about a specific analyte. An indicator electrode or working electrode responds to changes in the activity of the analyte while a reference electrode (self-contained half cell) produces a constant reference potential. Ion-selective electrodes ( e.g. pH glass electrode) respond mainly to one ion that selectively interacts with a specialized membrane of the electrode. The potential difference across the membrane ( E ) depends on the activity ( A ) of the analyte target ion (of charge n ) in the external analyte solution. At 25°C:
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Chapter 15 Electrodes and Potentiometry page 2 Reference Electrodes Anode: Ag + Cl AgCl + e Cathode: Fe 3+ + e Fe 2+ Ag( s ) | AgCl( s ) | Cl-( aq , satd) || Fe 3+ ( aq ), Fe 2+ ( aq ) | Pt( s ) E cell = E + E Measures [Fe 2+ ] [Fe 3+ ]
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Chapter 15 Electrodes and Potentiometry page 3 Silver-silver chloride reference electrode
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Chapter-15-Notes - Chapter 15 Electrodes and Potentiometry...

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