A high-precision titration of 4-aminopyridine A value for the faraday.
A specimen of 4-aminopyridine purified by repeated sublimation in an atmosphere of nitrogen has been titrated coulometrically in two ways: (1) directly, using the hydrazine-platinum anode, and (2) with perchloric acid, the titration being completed coulometrically and the perchloric acid being standardized coulometrically. The values for the faraday calculated from these titrations are 96,486.40 (1.53) and 96,486.78 (0.57), 1972 NBS coulombs per mole, respectively, the average being 96,486.69 (0.81) and the numbers in the parentheses the standard deviations. The maximum error obtained by combining the estimated maximum errors in the various measurements was 8.4 ppm.
Koch
W F
WF
Department of Chemistry, Iowa State University, Ames, Iowa 50010, U.S.A.
Hoyle
W C
WC
Diehl
H
H