
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./KG1. 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 liquidjunction and with transference, and from diffusion data. A nonlinear leastsquares program was used to fit data from all sources using both phi and 1n gamma as a function of molality. An eightparameter extended DebyeHuckel 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