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Unformatted text preview: E1/2 values are listed verses the SCE.
Not the same as Eo values
Are also dependent on the supporting
electrolyte used for the analysis.
Typical range is -1.9 to +0.2 V vs SCE. Supporting
E1/2 vs SCE electrolyte Reaction
-0.25 0.1 M KCl
4 M NH4Cl,1 M HCl Pb2+
-0.76 0.1 M KCl
0.4 M Na tartrate
1 M NaOH If more than a single species is present, the
curves will add on top of each other. i Note how the E1/2 value can be shifted by changing
the supporting electrolyte. V Potential is still varied linearly with time but the
current is only sampled for 5-20 msec/drop near the end.
This results in smoother data.
i V t classical
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- Fall '08