Accession Number : AD0285362

Title :   THERMODYNAMIC PROPERTIES OF METAL SULFIDES

Corporate Author : GENERAL DYNAMICS/FORT WORTH TEX

Personal Author(s) : GRAY,E.L.

Report Date : 13 OCT 1958

Pagination or Media Count : 1

Abstract : An electrochemical method based on thermodynamic principles was used. The method consisted of the accurate measurement of the electromotive force of the following galvanic cells: Cu, Cu2S:H2, Pt and Cu, Cu2S:Ag2S, Ag. From this measured potential the standard electromotive force was calculated and from this standard electromotive force the standard free energy change of the cell reactions was determined. From these values and data from other sources for the free energy of formation of the sulfide ion, the cuprous ion, H2S gas and solid Ag2S the following thermodynamic constants of cuprous sulfides were calculated: 20.1 K cal/mole for free energy of formation 3.5 x 10 to the minus 48th power for the solubility product constant. (Author)

Descriptors :   *METALLIC COMPOUNDS, *SULFIDES, *THERMODYNAMICS, CHEMICAL EQUILIBRIUM, CHEMICAL REACTIONS, COPPER COMPOUNDS, ELECTRODES, ELECTROLYTIC CELLS, ENTROPY, HEAT OF FORMATION, HYDROGEN, PLATINUM, SILVER COMPOUNDS, SOLUBILITY, TEST EQUIPMENT, THEORY

Distribution Statement : APPROVED FOR PUBLIC RELEASE