Equivalent conductivities of dilute solutions of calcium nitrate, cadmium nitrate, zinc nitrate, and calcium chloride (c < 0.0021 eq.dm(-3)) were measured in binary aqueous mixtures containing up to 70 wt% cosolvent (methanol, ethanol, and acetone) at 298.15 K +/- 0.1. Data were treated by the Fuoss-Edelson equation, and its parameters, the limiting equivalent conductivity, Lambda(0), and the primary association constants, K-1A, were evaluated. Variations in Walden products and K-1A were interpreted in terms of ionic properties as well as solvent structure and dielectric constant.