Densities, Viscosities [from (278.15 to 318.15) K]
and Conductivities (at 298.15 K) of Aqueous Solutions of Choline Chloride and Chloro-Choline Chloride
S. Shaukat and R. Buchner*,
J. Chem. Eng. Data (Kenneth N. Marsh Festschrift 56 (2011) 4944-4949. DOI: 10.1021/je200856f
Data for the electrical conductivity (at 298.15 K), density, and viscosity [both at (278.15, 288.15, 298.15, 308.15,
and 318.15) K] of aqueous solutions of choline chloride (ChCl) and chloro-choline chloride (Cl-ChCl) are reported for
solute molalities m ≤ 2.0 mol kg-1 (ChCl) and ≤ 2.1 mol kg-1 (Cl-ChCl), respectively.
From the densities apparent molar volumes were calculated, and the limiting partial molar volumes and Hepler's constants
of ChCl(aq) and Cl-ChCl(aq) were evaluated. From the viscosities Arrhenius activation energies of viscous flow were determined.
While apparent molar volumes suggest at best weak ion pairing for ChCl(aq) and Cl-ChCl(aq), the Walden product obtained for 25 °C
hints at significant ion ion interactions and/or changes in ion hydration with increasing concentration.