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Title of Journal: J Therm Anal Calorim

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Abbravation: Journal of Thermal Analysis and Calorimetry

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Springer Netherlands

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DOI

10.1016/0010-4361(94)90216-x

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ISSN

1572-8943

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Heats of solution in water of salts of the type R

Authors: L H Blanco Yina P Salamanca E F Vargas
Publish Date: 2008/07/02
Volume: 92, Issue: 3, Pages: 683-686
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Abstract

The tetraalkylammonium halides are electrolytes that have special characteristics due to the presence of hydrocarbon chains They have been used asmodel compounds to study hydrophobic interactions due to their fairly large solubility in water and because of the possibility of change in the length and geometry of the alkyl chains In this work the solution enthalpies of tetranbutylammonium bromide tetrasecbutyl ammonium bromide tetraisobutylammonium bromide and dinbutyldisecbutyl ammonium bromide were determined at 29815 K at concentrations between 0001 and 001 mol kg−1 The experimental method used was isoperibol calorimetry The results were extrapolated fitting the experimental data by least squares to obtain the solution enthalpies at infinite dilution The hydrocarbon chains studied were so chosen because the tetranbutylammonium ion is considered to be a structure maker for water The results show that the geometry of the ion and of the hydrocarbon chains play an important role in the behavior properties of the solutions

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