Additional results on the value of the faraday.
Repetition of the authors' earlier high-precision coulometric titrations of 4-aminopyridine by the hydrazine-platinum anode and back-titration methods, at the National Bureau of Standards, has yielded a new value for the Faraday, almost identical with the earlier value but with lower uncertainty. The earlier value has been recalculated, using a new value for the density of 4-aminopyridine. The weighted average of the new and old values is 96486.57 1972 NBS coulombs per equivalent, the standard deviation of the mean being 0.48 coulombs per equivalent (4.9 ppm).
Koch
W F
WF
Department of Chemistry, Iowa State University, Ames, IA 50011, U.S.A.
Diehl
H
H