Dielectric constants, viscosities, and densities for acetonitrile-water and acetonitrilemethanol mixtures have been determined at 25' C. Viscosities, refractive indices, and densities at 25'C., as well as freezing point data, are reported for ethylene carbonate-water mixtures. Where possible, the data are compared with previously reported values. Molar polarizations for the acetonitrile mixtures are shown to be linear functions of the weight per cent through the complete range of solvent mixtures.

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Equivalent conductances of the alkali metal perchlorates and tetraphenylborides (Ph4B) in anhydrous acetonitrile at 25°are reported. The lithium salts were too unstable or too hygroscopic for precise measurements, although an estimated ionic mobility for the Li + ion is reported. All the perchlorates show some ion pair association, whereas the tetraphenylborides are all completely dissociated with the possible exception of cesium. The limiting ionic conductances, obtained from a Fuoss-Coplarr split for this solvent, are compared to similar data for methanol and ethanol solutions. For very large ions, the conductance-viscosity products are about the same.For ions of intermediate size, the dipole moment and size of the solvent molecules appear to be the mobility-determining factors, whereas for small ions, the relative acid-base strength of the solvent molecules rather than their dipole moments appears to be the important factor.