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Title: Conductance and viscosity measurements of some 1:1 electrolytes in dimethylformamide +methanol mixtures at 25, 30 and 40°C
Authors: Jauhar, S P
Sandhu, Seema
Issue Date: Apr-2000
Publisher: NISCAIR-CSIR, India
Abstract: Molar conductances and viscosities of some 1:1 alkali metal and tetraalkylammonium salts have been measured in dimethylformamide (DMF) +methanol (MeOH) mixtures containing 100, 89.3, 69.1, 49.6, 29.9 and 10.7 mol% DMF and pure MeOH at 25°C. The conductance data have been analysed by Shedlovsky method setting ion - size parameter equal to Bjerrum critical distance suggested by Justice to calculate Λo and KA. Calculation of limiting ionic conductances and solvated radii shows preferential solvation of ions in these mixtures. The viscosity data have been analysed using the Jones -Dole equation. The ion-solvent interaction parameter, viscosity B-coefficients have been found to be positive for all the electrolytes in all the systems. The ionic B±coefficients have been evaluated, by taking Bu4NBPh4 as reference electrolyte. Conductances and viscosities of three salts, NaBr, NaBPh4 and Bu4NBr, have been measured at 30 and 40°C in different solvent mixtures. The limiting ionic conductances and ionic viscosity B -coefficients for the ions show decreased salvation with increase in temperature.
Page(s): 392-399
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.39A(04) [April 2000]

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