Thermodynamics and Accurate Solubilities of Lithium and Sodium Salts in Imidazolium-Based Ionic Liquids
Year: 2026
Type: preprint
Abstract: Determining the solubility of metal salts in ionic liquids is challenging using visual methods or Differential Scanning Calorimetry (DSC). The slow crystallization kinetics of the metal salts impede accurate Solid-Liquid Equilibrium (SLE) measurements, resulting in significant discrepancies in the limited available literature. We propose Isothermal Titration Calorimetry (ITC) as an alternative technique to measure the solubility of metal salts in ionic liquids at different temperatures. Some new solubility data of lithium and sodium salts in imidazolium ionic liquid were determined. We show how the ITC experiments not only provide accurate solubility data at the studied temperatures but also reveal key thermodynamic properties of dissolution, including the enthalpy of dissolution; the mixing enthalpy and the partial molar excess enthalpy of both components at saturation.
Source: ChemRxiv
Institutions: École Normale Supérieure de Lyon, Laboratoire de Chimie
Language: English
Subfield: Physical and Theoretical Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7214726743