Osmotic and activity coefficients of dilute aqueous solutions of the series Me4NI to MeBu3NI at 298.15K

Autor:	Luis H. Blanco, G. Eliseo Amado, Julio C Calvo
Rok vydání:	2008
Předmět:	Activity coefficient Aqueous solution Series (mathematics) Vapor pressure Chemistry General Chemical Engineering Inorganic chemistry General Physics and Astronomy Thermodynamics Pitzer model Negative deviation Gravimetric analysis Osmotic coefficient Physical and Theoretical Chemistry
Zdroj:	Fluid Phase Equilibria. 268:90-94
ISSN:	0378-3812
DOI:	10.1016/j.fluid.2008.04.008
Popis:	Osmotic coefficients of dilute aqueous solutions of Me4NI, Me3BuNI, Me2Bu2NI and MeBu3NI were determined by the isopiestic method at 298.15 K. A gravimetric isopiestic vapor pressure technique was used. The osmotic coefficients of tetra-alkyl-ammonium solutions were analyzed with the Debye–Huckel limiting law. The results show that the osmotic coefficient varies in the following way: Me4NI > MeBu3NI > Me2Bu2NI > Me3BuNI. The negative deviation of activity coefficients values from the Debye–Huckel limiting law was interpreted in terms of ion-pair formation. The set of Pitzer parameters b = 1.2 and α1 = 2.0 was used. The results were fitted to the Pitzer model and the parameters β0, β1 and Cϕ were calculated. β0 and β1 were analyzed in terms of ion–ion interactions and ion–solvent interactions.
Databáze:	OpenAIRE
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