The velocity (v) of ultrasonic waves of 3 MHz frequency and density (ρ) have been measured in various binary solutions of methanol, ethanol and phenol in sulpholane at 313.15 K and used to calculate several acoustical parameters. The interaction with sulpholane has been found to be in the order of MeOH > EtOH > PhOH. In spite of the greater electron density on phenoxide ion, the ion-solvent interaction is least in phenol-sulpholane solutions; presumably due to intensive delocalization of electrons on the phenoxide ion.