Densities, Excess Molar Volumes, Speeds of Sound, and Isothermal Compressibilities for 2-(2-Hexyloxyethoxy)ethanol + <i>n</i>-Alkylamine at Temperatures Between 288.15 K and 308.15 K

Abstract

The densities, ρ, and the speeds of sound, u, for binary liquid mixtures containing 2-(2-hexyloxyethoxy)ethanol (C 6 E 2 ) and n -butylamine (BA), dibutylamine (DBA), and tributylamine (TBA) have been measured as a function of composition using a vibrating tube densimeter and sound analyzer Anton-Paar model DSA-5000 at temperatures (288.15, 293.15, 298.15, 303.15, and 308.15) K and atmospheric pressure. The ρ and u values were used to calculate excess molar volumes, V m E, and excess molar isentropic compressibility, K S,m E, respectively. The V m E and K S,m E values are shown to be negative for all the mixtures over the entire composition range. Both V m E and K S,m E become more negative for all the mixtures with the rise of temperature. The change of V m E and K S,m E with composition and temperature are discussed with a view to understand molecular interactions present in alkoxyethanol-alkylamine mixtures.