Densities, p, and speed of sound, it, of the solutions of LiBr with non-aqueous solvents (methanol, ethanol, 2-propanol, acetone, and acetonitrile) having a wide range of dielectric constants were measured at T = 298.15 K. Also, these measurements were made for the system (LiBr + N,N-dimethylacetamide) at T = 323.15 K. For the investigated systems, the limiting values for apparent molar volume, V-phi(0), and the apparent molar isentropic compressibility, kappa(0)(phi), were obtained from the Redlich-Mayer and an abbreviated form of the Pitzer equations. The Pitzer and NRTL equations were satisfactorily used for the correlation of apparent molar volumes, 170, and the apparent molar isentropic compressibility, kappa(phi), values of the studied systems. (C) 2007 Elsevier Ltd. All rights reserved.