The Electrochemical Equivalent of Pure Silver-A Value of the Faraday.

Oxygen-free high-purity samples were used in a precise determination of the electrochemical equivalent of silver. A comprehensive mass spectrometric analysis for impurities was performed. Our value agrees well with prior measurements of the same quantity at the National Bureau of Standards (NBS) by Craig and coworkers. We find the electrochemical equivalent of pure silver to be 1.1179648 mg F = 96486.33 ( 24 ) A NBS ⋅ s ⋅ mol - 1 ( 2.5 ppm ) . Attached to this figure is an uncertainty whose random component (standard deviation of the mean of 8 determinations) is 9.5 × 10-7 mg C-1 (0.85 ppm). The root-sum-square of systematic uncertainties of known origin is 1.07 × 10-6 mg C-1 (0.96 ppm). The above value for the electrochemical equivalent of silver leads us to calculate the Faraday to be: F = 96486.33 (24) A NBS · s · mol-1 (2.5 ppm).

[1]  V. E. Bower,et al.  A Novel Method for Analyzing Silver Sediment With High Precision. , 1979, Journal of research of the National Bureau of Standards.

[2]  V. E. Bower,et al.  Direct Determination of Air Density in a Balance Through Artifacts Characterized in an Evacuated Weighing Chamber. , 1978, Journal of research of the National Bureau of Standards.

[3]  Frank E. Jones,et al.  The Air Density Equation and the Transfer of the Mass Unit. , 1977, Journal of research of the National Bureau of Standards.

[4]  Barry N. Taylor,et al.  Is the Present Realization of the Absolute Ampere in Error , 1976 .

[5]  W. F. Koch,et al.  A high-precision titration of 4-aminopyridine A value for the faraday. , 1975, Talanta.

[6]  Barry N. Taylor,et al.  The 1973 Least‐Squares Adjustment of the Fundamental Constants , 1973 .

[7]  G. Müller,et al.  Diffusion und Löslichkeit von Sauerstoft in Silber , 1962 .

[8]  W. Hamer,et al.  Determination of the Value of the Faraday With a Silver-Perchloric Acid Coulometer , 1960, Journal of research of the National Bureau of Standards. Section A, Physics and chemistry.

[9]  J. Bockris,et al.  Kinetics of the Deposition and Dissolution of Silver , 1960 .

[10]  W. F. Koch.  The Value of the Faraday Via 4-Aminopyridine , 1980 .

[11]  B. Longest.  Sampling techniques. , 1971, Hospitals.

[12]  P. E. Pontius,et al.  Realistic Uncertainties and the Mass Measurement Process: An Illustrated Review , 1964 .

[13]  A. Sieverts,et al.  Über die Löslichkeit von Wasserstoff und Sauerstoff in festem und geschmolzenem Silber , 1909 .