Densities and speeds of sound and their excess properties for 1-butyl-3- methylimidazolium Hexafluorophosphate [Bmim] [PF6] with 1-Hexanol over the entire range of mole fraction are reported at temperature 298.15 K and atmospheric pressure. Isentropic and excess isentropic compressibility for ionic liquid with 1-Hexanol were calculated from the experimental results. The excess values are fitted to the Redlich−Kister polynomial equation to estimate the binary coefficients and standard error between the experimental and calculated values. The measured speeds of sound were compared to the values obtained from Schaaffs' collision factor theory, Jacobson's intermolecular free length theory of solutions and Nomoto’s relation. The theoretical results obtained from these relations fairly agrees within the experimental precision. Further, the molecular interactions involved in IL binary mixture system were studied.
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