Abstract
The density, sound velocity, and viscosity of 1-ethyl-3-methylimidazolium chloride [C2mim]Cl in pure water and aqueous solutions of some electrolytes such as potassium chloride, potassium carbonate, and potassium phosphate (weight fraction of salt fixed at ws = 0. 11) have been measured over a wide range of temperatures from 298.15 to 318.15 K. The obtained experimental data have been used to compute various volumetric, compressibility, and viscometric parameters, e.g., apparent molar properties, limiting apparent molar and transfer properties. The co-sphere overlap model was employed to describe the dominant intermolecular interactions in the ternary solutions. Additionally, the structure making/breaking nature of the [C2mim]Cl in the ternary solutions has been discussed in terms of Hepler's constant and the temperature derivative of viscosity B-coefficient (dB/dT). The activation free energy of solvent and solute, activation enthalpy, and activation entropy have been calculated by the application of transition state theory. The calculated parameters have been interpreted in the sense of solvent–solute and solute–solute interactions. The Fourier transform infrared (FTIR) studies also have been done for the studied systems. Volumetric, acoustic, viscometric, and spectroscopic studies can render some evidence and help to understand the aqueous solution behavior of ionic liquids.
Highlights
The apparent molar volume in the aqueous electrolyte solutions is larger than that of pure water and increases by increasing the temperature. This means that the size of the solute [C2mim]Cl in aqueous electrolyte solutions is larger than in pure water
In the studied electrolyte solutions, the apparent molar volume decreased by increasing the charge of anions as follows: KCl > K2CO3 > K3PO4
The isentropic compressibility of all studied systems decreased by increasing the concentration of [C2mim]Cl and temperature
Summary
Aqueous Solution Behavior of 1-Ethyl-3-Methylimidazolium Chloride solubility (Wang et al, 2014; Sarmad et al, 2017; Cao et al, 2018; Xu et al, 2018; Hui et al, 2019; An et al, 2020; Wu et al, 2020) They are considered as potential environmentally friendly solvents to replace the common volatile organic solvents and reduce environmental footprints (Gomes et al, 2019; Kaur et al., 2020). Investigation of the physicochemical properties of the systems containing ILs in a wide range of pressures and temperatures is in demand. These properties are essential for optimizing and designing the systems containing IL and solvent in both laboratory and industrial scales. For the evaluation of molecular interactions, thermophysical properties and their deviations from ideality are important (Pal and Gaba, 2008)
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