Accession Number : ADD095188

Title :   Activity and Osmotic Coefficients of Aqueous Sulfuric Acid at 298.15 K,

Corporate Author : NATIONAL STANDARD REFERENCE DATA SYSTEM

Personal Author(s) : Staples, Bert R

Report Date : Jan 1981

Pagination or Media Count : 25

Abstract : A critical evaluation of the mean activity coefficient, gamma + or -, and osmotic coefficient, Phi of aqueous sulfuric acid at 298.15 K is presented for the molality range of 0 to 28 1/mol.kg. Osmotic coefficients were calculated from direct vapor pressure measurements, from isopiestic measurements or from freezing point depression measurements. Activity coefficients were calculated from electromotive force measurements of galvanic cells. A least-squares program was used to fit data from all sources using both Phi and 1n gamma + or -, as functions of molality. A nine parameter equation describes the osmotic coefficient, the mean activity coefficient, and the excess Gibbs energy as a function of the one-half power of molality. The scientific literature has been covered through January, 1980. (Author)

Descriptors :   *SULFURIC ACID, *SOLUTIONS(MIXTURES), *OSMOSIS, *COEFFICIENTS, MEASUREMENT, VAPOR PRESSURE, OSMOTIC PRESSURE, TEST AND EVALUATION, COMPUTATIONS, MEAN, ELECTROLYTES, FREE ENERGY, STANDARDS, LITERATURE SURVEYS

Subject Categories : Inorganic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE