Thermodynamics of aqueous solutions of the alkali metal sulfates

Journal Article · Sun Jun 01 04:00:00 EDT 1986 · J. Solution Chem.; (United States)

DOI:https://doi.org/10.1007/BF00644892· OSTI ID:7032438

Holmes, H F; Mesmer, R E

The available thermodynamic properties for aqueous solutions of each of the alkali metal sulfates have been combined and analyzed within the framework of the ion interaction model at temperatures up to 225/sup 0/C. It was necessary to set ..cap alpha../sub 1/ equal to 1.4 kg /SUP 1/2/ -mol /SUP 1/2/ in order to obtain a satisfactory fit. The temperature dependence of the ion interaction parameters was given the functional form used by Rogers and Pitzer in their study of Na/sub 2/SO/sub 4/(aq). With few exceptions, it was possible to reproduce the available thermodynamic data for aqueous solutions of the alkali metal to within the estimated experimental error. Thermodynamic results for Na/sub 2/SO/sub 4/(aq) appear to be adequate in this temperature range, but enthalpy and heat capacity data for the other alkali metal sulfate solutions are conspicuously lacking. Activity coefficients of these electrolytes decreased to less than 0.1 at moderate molalities at the higher temperatures, and their order changed with increasing temperature; two results which could be due to a combination of hydration and association effects.

• Research Organization: Oak Ridge National Lab., Oak Ridge, TN
• OSTI ID: 7032438
• Journal Information: J. Solution Chem.; (United States), Journal Name: J. Solution Chem.; (United States) Vol. 15:6; ISSN JSLCA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
AQUEOUS SOLUTIONS
BARIUM CHLORIDES
BARIUM COMPOUNDS
CALCIUM CHLORIDES
CALCIUM COMPOUNDS
CALCIUM HALIDES
CESIUM COMPOUNDS
CESIUM SULFATES
CHLORIDES
CHLORINE COMPOUNDS
COMPARATIVE EVALUATIONS
DIAGRAMS
DISPERSIONS
HALIDES
HALOGEN COMPOUNDS
HIGH TEMPERATURE
HYDRATION
LEAST SQUARE FIT
LITHIUM COMPOUNDS
LITHIUM SULFATES
MAGNESIUM CHLORIDES
MAGNESIUM COMPOUNDS
MAXIMUM-LIKELIHOOD FIT
MIXTURES
NUMERICAL SOLUTION
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
POTASSIUM SULFATES
QUANTITY RATIO
SODIUM CHLORIDES
SODIUM COMPOUNDS
SODIUM SULFATES
SOLUTIONS
SOLVATION
STRONTIUM CHLORIDES
STRONTIUM COMPOUNDS
SULFATES
SULFUR COMPOUNDS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES