SCAN0018 - Junction Potentials Region rich rnMe The...

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Unformatted text preview: Junction Potentials Region rich rnMe The differing mobilities of ions causes a local charge separation and electrical potential. ln general. any separation of charge density causes an electrical pmentlal. pH Selective Electrode Nate: the pH electrode is actually 2 ref electrodes contained In one pmbe— only glass touches the test solution! This electrode ‘teels' a diflerent potential environment due to the locallzed charge separation at the mm glass wall membrane \ E= constant + B(0.05916ln) IogAH, “96‘ " Where AH. = activity of H+ outside the electrode But how is the circuit completed it both Ag/Agm electrodes are » completely separated? r-wm‘w 1‘13"” “" may we was,» N W. -2 Wk: mm «mm m 6:13 am my $32?“ Analyts anlons diffuse 3“” I in through the salt bndge Na’ dlfiuses out of the glass to diffen 9 degrees according to the [H+] on each side of the glass to create a localized charge imbalance ...
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