Open AccessAbsolute determination of the electrochemical equivalent and the atomic weight of zinc. I. Method, apparatus, and preliminary experiments
Author(s) -
George Marinenko,
R. T. Foley
Publication year - 1975
Publication title -
journal of research of the national bureau of standards. section a. physics and chemistry
Language(s) - English
Resource type - Journals
eISSN - 2376-5704
pISSN - 0022-4332
DOI - 10.6028/jres.079a.030
Subject(s) - coulometry , zinc , electrolysis , electrolyte , electrochemistry , molality , corrosion , electrode , anode , materials science , reference electrode , equivalent circuit , analytical chemistry (journal) , chemistry , metallurgy , electrical engineering , voltage , chromatography , engineering , aqueous solution
The use of a specially designed coulometer and a high accuracy coulometric circuit resulted in the accurate measurement of the electrochemical equivalent and atomic weight of zinc. The experimental conditions to make possible the final precise and accurate measurements were established. These include a study of mechanical losses from the anode during the electrolysis and the corrosion of zinc in various media used in the determination. The effects of both of these sources of error may be controlled. Mechanical losses are minimized when an amalgamated electrode is used; corrosion, when an amalgamated electrode is used in an air free system. An electrolyte, 25 wt. percent NH 4 Cl and 3 molal ZnCl 2 . was used in these determinations. This report presents the account of research which was prerequisite to subsequent accurate determination of the electrochemical equivalent and the atomic weight of zinc.