Open AccessThe EMF-temperature coefficient of "acid" standard cells of the saturated cadmium sulfate type from 15 to 40 C
Author(s) -
Walter J. Hamer,
Anna Skapars,
B. F. Field
Publication year - 1972
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.076a.031
Subject(s) - electromotive force , cadmium , standard molar entropy , thermodynamics , chemistry , sulfate , atmospheric temperature range , analytical chemistry (journal) , correlation coefficient , mathematics , heat capacity , physics , statistics , chromatography , electrical engineering , organic chemistry , engineering
This paper gives the results of new measurements of the effect of temperature on the electromotive force of standard cells of the saturated cadmium sulfate type. Measurements were made over the temperature range of 15 to 40 °C. Twelve cells of NBS manufacture and twenty-four cells supplied by two different commercial manufacturers were used in the studies. Final results were analyzed by the method of least squares using computer programs. The relation between emf and temperature for NBS, company 1, and company 2 cells was found to be given, respectively, by: E t = E 20 ° C - [ 40.44 ( t - 20 ) + 0.921( t - 20 ) 2 - 0.00866( t - 20 ) 3 ] × 10 - 6 VE t = E 20 ° C - [ 40.14 ( t - 20 ) + 0.888( t - 20 ) 2 - 0.00668( t - 20 ) 3 ] × 10 - 6 VE t = E 20 ° C - [ 39.28 ( t - 20 ) + 0.986( t - 20 ) 2 - 0.00943( t - 20 ) 3 ] × 10 - 6 V Values for the entropy and heat-capacity changes for the cell reaction in "acid" standard cells are also given.