Accession Number : ADD095080

Title :   The Activity and Osmotic Coefficients of Aqueous Calcium Chloride at 298.15 K,

Corporate Author : NATIONAL STANDARD REFERENCE DATA SYSTEM

Personal Author(s) : Staples, Bert R ; Nuttall, Ralph L

Report Date : Jan 1977

Pagination or Media Count : 27

Abstract : A critical evaluation of the mean activity, gamma, and osmotic coefficients, phi, of aqueous calcium chloride at 298.15 K is presented for the concentration range of 0 to 10 mol./KG-1. 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, both without liquid-junction and with transference, and from diffusion data. A non-linear least-squares program was used to fit data from all sources using both phi and 1n gamma as a function of molality. An eight-parameter extended Debye-Huckel equation describes the osmotic coefficient, the mean activity coefficient, and the excess free energy as a function of molality. The scientific literature has been covered through July, 1976. (Author)

Descriptors :   *THERMODYNAMIC PROPERTIES, *CALCIUM COMPOUNDS, *CHLORIDES, *OSMOSIS, *COEFFICIENTS, TEST AND EVALUATION, DIFFUSION, VAPOR PRESSURE, GALVANIC CORROSION, SCIENTIFIC LITERATURE, PRESSURE MEASUREMENT, FREEZING, ANTIFREEZES, LEAST SQUARES METHOD, TABLES(DATA), ELECTROLYTES, NONLINEAR SYSTEMS, MEAN, LIQUIDS

Subject Categories : Inorganic Chemistry
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE