The current-voltage curve for the reduction of Cu(II) in 2M HC1 at the G.C.E. has two distinct peaks in contrast with that for the reduction at the P.G.E. which gives only one discernible peak. Both waves are easily measured and increase in direct ratio to an increase in Cu(II) concentration.Presumably, these peaks represent the reductions

39) TVA, unpublished research on system Ca0-P205-HF-H20. (40) Wall, F. T., Grieger, P. F., Childers, C. W., J. Am. Chem. Soc. 74, 3562 (1952).(41) Wildermann, M., Z. physik. Chem. 66, 445 (1909).

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