ESCALA DE LILEY PDF

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Thermodynamic aspects of partial miscibility between n -octanol and water. In the present work the thermodynamic analysis for those data presented by Dallos and Liszi on mole fraction n-octanol-water liquid-liquid equilibria was made. A non-lineal behavior was found in all cases studied by the van’t Hoff method, which lead us to apply a parabolic regression model derived in order to calculate the enthalpic changes.

Endothermic processes were obtained for all temperatures studied.

Thermodynamic aspects of partial miscibility between n-octanol and water

In both systems the free energy changes were positive, whereas the entropic changes were negative indicating some kind of organization in the saturated solutions. In the case of n-octanol-saturated water this result would escaal explained as the hydrophobic hydration around the aliphatic groups and on the other hand, in the case of water-saturated n-octanol, it could be due to organization of n-octanol molecules around water molecules by hydrogen bonds as it has been presented in literature.

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The thermodynamic values calculated were compared with those presented by other authors, which were obtained by escaala and also by means of equilibrium constants as a function of temperature. Donde R es la constante universal de los gases 8. Los cuales son corregidos mediante la Ec.

Las masas molares de los dos solventes son Se observa claramente en la Tabla I que la miscibilidad parcial es dependiente de la temperatura. De la Tabla I se tiene que g 2 para el n-octanol en agua es mayor quemientras que g 2 para el agua en el n -octanol es cercano a 3.

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Estas ecuaciones son derivadas y resueltas punto a punto para hallar D H app soln a cada temperatura entre Utilizando los coeficientes a y b se hallaron los valores de D H app soln mediante la Ec. Adicionalmente se procesaron los datos presentados por otros investigadores, en particular los de Stephenson et al. Recientemente Perlovich et al.

Del tratamiento anterior se obtuvieron los siguientes valores a Adicionalmente Perlovich et al. Standard thermodynamics of transfer. Tanford’s comments concerning standard states lipey the thermodynamics of transfer. Thermodynamic study of organic compounds in octanol. An encyclopedia of chemicals, drugs, and biologicals. Enthalpy-entropy compensation for the solubility of drugs in solvent mixtures: Paracetamol, acetanilide, and nalidixic acid in dioxane-water.

Hydrogen-bonding effect of organic solutes on log P. ThermodynamicsAmsterdam, v. Investigation of structure, dynamics, and solvation in 1-octanol and its water-saturated solution: Molecular organization of liquid n-octanol: An X-ray diffraction analysis.

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Nonlinear van’t Hoff solubility-temperature plots and their pharmaceutical interpretation. Fundamentals and applications in chemistry and biology. American Chemical Society, Fundamentals and Physical Chemistry. Determination of differential heat of solution in real solutions from variation in solubility with temperature.

Thermodynamic investigation of the effect of octanol-water mutual miscibility on the partitioning and solubility of some guanine derivatives. Separation of the chemical from the statistical effects.

Partition coefficients and their uses. CRC Handbook of chemistry and physics. Effects of solvent luley on solubility. Enthalpic and entropic contributions to the free energy changes of di-substituted benzene derivatives in ethanol: Efecto de la lliey parcial entre octanol y agua sobre la solubilidad y el reparto de algunas sulfonamidas.

Thermodynamic study of the solubility of some sulfonamides in octanol, water, and the mutually saturated solvents. Thermodynamic study of partitioning of sulfanilamide and sulfamethoxazole at two pH values.

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Thermodynamics of solutions III: DataNew York, v. Standard states in the thermodynamics of transfer. Classical Thermodynamics of nonelectrolyte solutions.

McGraw Hill Book Company, Solubility and solubilization in aqueous media. All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License.

Services on Demand Journal. How to cite this article.