Acetone +NN-dimethylformamide solvent system. Part 3.—Viscosity measurements of some electrolytes in acetone, NN-dimethylformamide and acetone +NN-dimethylformamide mixtures at 25 °C
- 1 January 1982
- 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. 78 (2) , 475-484
- https://doi.org/10.1039/f19827800475
Abstract
Viscosities of Bu4NBPh4, Bu4NNO3, Bu4NI, NaBPh4, NaClO4, KClO4, KI and AgNO3 have been measured in acetone (Ac), NN-dimethylformamide (DMF) and in acetone +NN-dimethylformamide (Ac + DMF) mixtures in the concentration range (25–575)× 10–4 mol dm–3 at 25 °C. The viscosity data in all those cases where no ion association of the electrolytes occurs have been analysed using the Jones–Dole equation in the form: η/η0= 1 +AC1/2+BC; where ion association occurs the following equation was used: η/η0= 1 +A(Cα)1/2+BCα+B′(1 –α)C. The A coefficients are positive in almost all cases and are in reasonable agreement with the limiting theoretical values calculated from Falkenhagen–Vernon equation. The B coefficients are also positive and large in all cases. A new approach has been proposed to resolve B coefficients into the contributions of individual ions and the ionic B+ and B– coefficients have been obtained using this approach. The B+ and B– coefficients have been interpreted in terms of ion–solvent interaction. The conclusions drawn from viscosity measurements are in agreement with those obtained from conductance measurements.Keywords
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