The relative viscosities for solutions of several alkali-metal chlorides and bromides in 2-methoxyethanol have been determined at 25 and 35 "C. Viscosity B coefficients were positive and decreased as the size of the alkalimetal ion increased with the exception of sodium halides; the values were greater for bromides than for chlorides. The thermodynamic parameters have been evaluated using the transition-state treatment and temperaturecoefficient measurements. The ionic B coefficients and other single-ion parameters have been determined using the ' reference electrolyte ' method. The results indicate that the Na' ion behaves as a structure-maker whereas others are structure-breakers in this solvent medium.

The conductances of a number of alkali-metal chlorides and bromides, MX(M+ = Li, Na, K, Rb, Cs and X-= C1, Br) have been measured in 2-methoxyethanol (ME) at 25 "C and the data have been analysed by the 1978 Fuoss Conductance equation in terms of the limiting molar conductance AO, the association constant, KA and the association distance, R.Single ion conductivities have been determined using Bu,NBPh, and Bu,NBBu, as reference electrolytes. Strong association was found for all these salts in ME and the limiting conductances (Ao) were in the order Li > Na < K < Rb < Cs and C1 > Br. Evaluation of Stokes radii indicates that NaCl and NaBr form ion pairs with fully solvated ions while in other cases some solvent molecules are perhaps included in the ion pair.2-Methoxyethanol (ME) has attracted much attention in recent years as a solvent medium for various electrochemical investigations. ' Although a number of precise conductance measurements of alkali-metal halides in other solvents are known in the literat~re,~-' relatively few studies of such a nature have been made in 2-methoxyethanol. In this paper an attempt has been made to reveal the nature of ion-solvent interactions of alkali-metal halides with 2-methoxyethanol through the measurement of their conductances at 25 "C. Since transference number data for solutions of these salts are lacking in ME, single ion conductivities have been evaluated using two reference electrolytes, uiz. Bu,NBBu, and Bu,NBPh,, in an effort to provide reliable values of ionic mobilities.

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