Volume 10, Issue 3, July 1981
Index of content:
Thermodynamic tabulations for selected phases in the system CaO‐Al2O3‐ SiO2‐H2 at 101.325 kPa (1 atm) between 273.15 and 1800 K10(1981); http://dx.doi.org/10.1063/1.555645View Description Hide Description
The standard thermodynamic properties of phases in the lime‐alumina‐silica‐ water system between 273.15 and 1800 K at 101.325 kPa (1 atm) were evalated from published experimental data. Phases included in the compilation are boehmite, diaspore, gibbsite, kaolinite, dickite, halloysite, andalusite, kyanite, sillimanite, Ca‐Al cliniopyroxene, anorthite, gehlenite, grossular, prehnite, zoisite, margarite, wollastonite, cyclowollastonite ( = pseudowollastonite), larnite, Ca olivine, hatrurite, and rankinite. The properties include heat capacity,entropy, relative enthalpy, and the Gibbs energy function of the phases and the enthalpies,Gibbs energies, and equilibrium constants for formation both from the elements and the oxides. Tabulated values are given at 50 K intervals with the 2‐sigma confidence limit at 250 K intervals. Summaries for each phase give the temperature‐ dependent functions for heat capacity,entropy, and relative enthalpy and the experimental data used in the final evaluation.
Evaluated activity and osmotic coefficients for aqueous solutions: thirty‐six uni‐bivalent electrolytes10(1981); http://dx.doi.org/10.1063/1.555646View Description Hide Description
A critical evaluation of the mean acivity and osmotic coefficients in aqueous solutions of thirty‐five uni‐bivalent electrolytes at 298.15 K is presented. The systems which have been treated are ammonium orthophosphate, guanadinium carbonate, 1,2‐ethane disulfonic acid,m‐benzene disulfonic acid, ammonium decahydroborate, and the unibivalent compounds of lithium,sodium, potasium, rubidium, and cesium. Osmotic coefficients were calculated from direct vapor pressuremeasurements, from isopiestic measurements and from freezing‐point depression measurements. Activity coefficients were calculated from electromotive force measurements on galvanic cells without transference and from diffusionmeasurements. Given are empirical coefficients for three different correlating equations, obtained by a weighted least squares fit to the experimental data, and tables consisting of the activity coefficients of the compounds, the osmotic coefficients and activity of water, and the excess Gibbs energy of the solution as functions of the molality for each electrolyte system. The literature coverage is through the computerized version of Chemical Abstracts of September 1979.
10(1981); http://dx.doi.org/10.1063/1.555647View Description Hide Description
A critical evaluation of the mean activity γ±, and osmotic coefficients, φ, of aqueous alkali metal nitrites at 298.15 K is presented for the molality range from dilute to saturation. Osmotic coefficients were calculated from static vapor pressure measurements. A nonlinear least‐squares program was used to fit φ data as a function of molality. Several equations describe the osmotic coefficient, the mean activity coefficient, and the excess Gibbs energy as a function of the square‐root of molality for each slit. The scientific literature was covered through March 1979.
10(1981); http://dx.doi.org/10.1063/1.555648View Description Hide Description
A critical evaluation of the mean activity coefficient, γ±, and osmotic coefficient, φ, of aqueous sulfuric acid at 298.15 K is presented for the molality range of 0 to 28 mol⋅kg−1. Osmotic coefficients were calculated from direct vapor pressuremeasurements, from isopietic 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 φ and ln γ± 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, 1979.