Choline chloride aqueous solution: A thermophysical study

Choline Chloride (ChCl) is a salt considered necessary in several areas since health until technology. In this work, experimental data were analyzed by solubility (293.15 to 343.15 K), density (278.15 to 353.15 K), speed of sound (278.15 to 353.15 K), and dynamic viscosity (293.15 to 353.15 K) to choline chloride aqueous solutions with different solute molalities at atmospheric pressure. Thermodynamic properties such as Gibbs energy and entropy, apparent molar volume, isentropic and apparent molar compressibility, and Arrhenius activation energy of the viscous flow were evaluated from these data. These data allow a qualitative understanding of the solution behavior through solute-solvent and solute–solute interactions. In addition, surface tension data at 298.15 K in different concentrations was determined to identify what kind of behavior has this organic compound. Molar volume and isentropic compressibility data suggest significant ionic interactions and changes in the ion hydration with increasing concentration. In addition, the system presents a clathrate-like formation in the structure. Furthermore, the interfacial behavior classifies the salt as a surfactant.