Analysis of the Molecular Interactions of Potassium Chloride Solutions in N-Methylmorpholine by Physical Methods at Different Temperatures

M. Khamase, Saba; F.Al.Azzaawi, Soad; M.Saleh, Mohammad

	Analysis of the Molecular Interactions of Potassium Chloride Solutions in N-Methylmorpholine by Physical Methods at Different Temperatures
Baghdad Science Journal
Article 1, Volume 4, Issue 2, 2007, Pages 174-178
Authors
Saba M. Khamase; Soad F.Al.Azzaawi; Mohammad M.Saleh
Abstract
In this study, the densities,  viscosities,  and refractive index, nD were measured for the binary mixtures of N-methylmorpholine and water, in different weight percentages (25%, 50% and 75%) and at three different temperatures 298.15 K, 308.15 K and 318.15 K. The experimental results of the densities, viscosities and refractive index of the binary mixtures of N-methylmorpholine and water, the excess molar volumes, VE excess viscosities, E and excess refractive index, nE were calculated. the experimental results of the mixtures containing potassium chloride within the concentration range (0.00250.1 M), we have found that the potassium chloride is a structure breaker for the mixtures of water and solvent. At the same time potassium chloride increases the molecular interaction between salt ion with water and with solvent as indicated from B-coefficient values of Jones-Dole equation: (rel  1) /  A + B where the A-coefficient indicates the interaction between ion-ion, and B-coefficient indicates the interaction between ion and solvent. The study showed that the increasing the concentration of N-methylmorpholine causes decreasing in B-coefficient value and this prove that the salt is a structure maker for mixtures of water with solvent. Calculation of the excess activation energy of viscous flow, G*, proved that the highest value of activation energy achieved when the mixture contains equal weight (50% : 50%) of water and solvent N-methylmorpholine.

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