Viscometric measurements of numerous electrolytes in ethylene carbonate (EC) at 40°C are reported. B-coefficients, obtained by the Jones-Dole equation, are compared with those relative to other dipolar aprotic solvents. Conductometric measurements in EC for some salts are also reported, so that these, together with the viscometric data, permit a more complete analysis of ions o lvent interaction,We are systematically studying the transport properties of electrolytes in dipolar aprotic solvents to obtain information on the behaviour of ions in this class of solvents. We have previously reported viscometric measurements in sulpholane (TMS)' and hexamethylphosphotriamide (HMPT).' In the present paper we have extended our studies to ethylene carbonate (EC). This solvent possesses a higher dielectric constant than water and a high dipolar moment (E = 90.36 and p = 4.87 D It has been used as solvent because it possesses these properties to realize high energy nonaqueous batteries? Information in the literature on solute-solvent interactions in EC has been obtained through measurements of osmotic coefficients and activity and conductometric measurem e n t~.~ In order to be able to compare the behaviour of a wider variety of ions in EC, both viscometric and further conductometric measurements have been carried out in this solvent.at 40°C) and is slightly structured.4* EXPERIMENTAL EC was distilled three times under reduced pressure. The method of salt purification, ihe apparatus and the method used for measuring viscosities, densities and conductances of solutions have already been described.' * The density, viscosity and specific conductance of EC at 40°C were : 1.320 99+ 0.000 04 g ~m -~, (1.925+0.002)x Viscosity and density measurements were carried out at 40+_ O.Ol"C, the conductonietric ones at 40.000+ 0.002"C.The viscometer was calibrated with water and aqueous solutions of sucrose (Fisher certified ACS) by means of the equation : kg m-l s-l and 1 x lo-' S cm-', respectively.where q is the absolute viscosity, p is the density and t is the flow time of the calibrating solution. The values of the characteristic viscometer constants K and L are 0.004 742xThe conductance cell was of the Erlenmeyer type as described by Dagget, Bair and Kraus. m2 s -~ and 2.315 x m2, respectively.Its constant was determined at 25°C by measuring the conductance of aqueous potassium chloride solutions, as suggested by Ying-Chech Chiu and FUOSS." The cell constant was 0.216 54+0.000 02 cm-1. Previous experience l 1 indicates that the cell constant does not significantly change between 25 and 40°C.The viscosity of the solutions was calculated by eqn (1).
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