The electrical conductivity of NaBr solutions and the emf of the cell : glass electrode (Na)\NaBr\AgBr\Ag in mixtures of water with propan-2-ol in the range 0-80 wt.% have been measured at 298.15 K. The values of limiting molar conductance (Lambda(0),), association constants (K-A), and the parameter of distance of ions (R) were obtained with the Fuoss-Justice equation. From the conductivity data obtained, the values of the Walden products (Lambda(0)eta) were also calculated. The values of the Gibbs energy of transfer (Delta(t)G(o)) of NaBr from the water to the mixtures of water with propan-2-ol mixtures were obtained from the emf data. The dependencies of viscosity (eta), limiting molar conductance (Lambda(0)), Walden products (Lambda(0)eta), association constants (K-A) and the Gibbs energy of transfer (Delta(t)G(o)) of NaBr versus the mixed solvent composition have been discussed. The obtained results were compared with those obtained earlier for sodium chloride and iodide.