Abstract

AMADO-GONZALEZ, Eliseo; QUIJANO-PARRA, Alfonso  and  BLANCO, Luis H. Prediction of Molal Apparent Heat Capacity and Critical Micellar Concentration (cmc) of Aqueous Solutions of Quaternary Ammonium Salts at Temperature (283.15 to 298.15) K. Ciencia en Desarrollo [online]. 2016, vol.7, n.2, pp.153-160. ISSN 0121-7488.

Abstract The aim of the research is to predict the apparent heat capacity (C^φ_p ) of aqueous solutions of quaternary ammonium liquid ionics of Bu4NBr, sec-Bu4NBr, iso-Bu4NBr, and Bu2Et2NBr BuEt3NBr by Pitzer equation modified depending on temperature (283.15 to 298.15) K at concentration range (0.09 to 1.1) m. The functions of the heat capacity are calculated by surface response methodology. The critical micelle concentration for salts was found around (0.4 to 0.45) 298.15 K m by Desnoyers model. The numbers of aggregation for solvation (n) ranging from 11-16 to 298. 15 K. The stoichiometric ratios of solvation for each salt are proposed.

Keywords : Pitzer Semi-Empirical Equation Modified; Osmotic Coefficient; Apparent Molal Calorific Capacity; Tetra-Alkyl-Ammonium Quaternary Salts.

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