Experimental and Modeling Studies on the Densities of Aqueous Solutions of 1-Carboxymethyl-3-methylimidazolium Chloride, 1-Carboxymethyl-3-propylimidazolium Chloride, and 1-(2-Hydroxylethyl)-3-propylimidazolium Chloride at (293.15, 298.15, and 303.15) K

The densities of the binary aqueous solutions of 1-carboxymethyl-3-methylimidazolium chloride ([HOOCMMIm]Cl), 1-carboxymethyl-3-propylimidazolium chloride ([HOOCMPIm]Cl), 1-(2-hydroxylethyl)-3-propylimidazolium chloride ([HOEtPIm]Cl), and the ternary solutions [HOOCMMIm]Cl + [HOOCMPIm]Cl + H2O, [HOEtPIm]Cl + [HOOCMPIm]Cl + H2O, and [HOEtPIm]Cl + [HOOCMMIm]Cl + H2O have been measured at (293.15, 298.15, and 303.15) K, respectively. The densities of the examined ternary solutions have been predicted by the equation of Patwardhan and Kumar established for the density of aqueous electrolyte solutions. The predictions were not very satisfactory probably due to the presence of the functional group −COOH. The coupling of the Patwardhan and Kumar’s equation and the rule of Young and Smith considerably improves the predictions, and the predicted results show excellent agreements with the experimental results.