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Información tecnológica

On-line version ISSN 0718-0764

Abstract

PAEZ, Manuel S; ALVIS, Armando  and  ARRAZOLA, Guillermo. Volumetric Properties of Trifluorometanosulfonato 1-ethyl-3-Metilimidazolio in Aqueous Solution of Pentahydrated Sodium Thiosulfate at Different Temperatures. Inf. tecnol. [online]. 2015, vol.26, n.5, pp.105-112. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642015000500014.

Densities of pseudobinary mixture of water  1-ethyl-3-methyl-imidazolium trifluoromethanesulfonate (Emim  CF3SO3  )  aqueous solution of sodium thiosulfate pentahydrate (Na2S2O3.5H2O) were experimentally determined at temperatures from 283.15 to 318.15 K, using an Anton Paar model DMA 5000 vibrating tube densitometer. From these data the apparent molar volumes(VΦ0), limiting apparent volumes (VΦ0) and standard volumes of transfer ( trVΦ0) were calculated. The limiting apparent molar volume was correlated with the temperature leading to a negative second derivative of the limiting apparent molar volume respect to the temperature  . This fact could indicate that Emim  CF3SO3   behaves as a solute capable of braking the solvent structure, while the positive value for  trVΦ0 could indicate the prevalence of ion-ion interactions in the solution, which confirms the results of Hepler´s criterion.

Keywords : trifluorometanosulfonato 1-ethyl-3-metilimidazolio; density; apparent molar volume; solute-solvent interactions.

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