Conductometric study of ion association of divalent symmetric electrolytes: II. MgSO 4 in water + 1,4-dioxane mixtures

• Published in: Journal of molecular liquids Vol. 131; pp. 29 - 35
• Main Authors: Bešter-Rogač, M., Hauptman, N., Barthel, J.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2007
• Subjects: 1,4-dioxane–water mixtures; Chemical model; Electrolyte conductivity; Magnesium sulfate; Magnesium sulfate; 1,4-dioxane–water mixtures; Electrolyte conductivity; Chemical model
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2006.08.024

Electric conductivities of diluted magnesium sulfate solutions in binary mixtures of 1,4-dioxane with water were measured covering a solvent composition range up to 50 wt.% of 1,4-dioxane at temperatures from 5 to 35 °C. Evaluation of the limiting molar conductivity Λ ∞ and the association constant K A is based on the chemical model of electrolyte solutions, including short-range forces. From the temperature dependence of the limiting molar conductivities Eyring's enthalpy of activation of charge transport was estimated. The standard Gibbs energy, enthalpy and entropy of the ion-pairing process were calculated from the temperature dependence of the ion-association constants.