Viscosity of Na2SO4 and MgSO4 solutions in ethanol–water mixtures at 15, 25 and 35 °C
- 1 January 1986
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 82 (11) , 3307-3314
- https://doi.org/10.1039/f19868203307
Abstract
The viscosities of the associated electrolytes Na2SO4 and MgSO4 have been measured in the following water-rich mixtures of ethanol and water: 0, 5, 10, 15, 20, 25 and 30 wt% ethanol at 15, 25 and 35 °C, and the Jones–Dole equation has been found to be in good agreement with experiments in the concentration range studied: 10–3 < c/mol dm–3 < 5 × 10–2. From conductance measurements the association constants in these systems at 25 °C were calculated, and the degrees of association and the Bion and Bion-pair coefficients were obtained. The viscosity decreases through ion-pair formation in the Na2SO4 solutions and it is a constant factor in the MgSO4 solutions. The ion–solvent interaction increases in the MgSO4 and decreases in Na2SO4 as the permittivity of the medium decreases. The BMg2+ coefficients suggest that these ions are controlling the viscosity of the solutions to a greater degree than was expected.Keywords
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