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The present study aimed to determine the refractive indices at 293.15 K and density data at T= (283.15, 293.15, 303.15 and 313.15) K of the binary mixtures of 1- ethyl - 3 - methylimidazolium ethylphosphonate + methanol or 2-propanol under the atmospheric pressure. The excess molar volume, the apparent molar volume, the partial molar and excess partial molar volumes of the components at infinite dilution were calculated from the experimental values. The results of excess molar volumes were fitted to a Redlich– Kister equation, leading thus to obtain the coefficients and to estimate the standard deviations between the experimental and the calculated quantities. Also, the results of excess molar volumes of the two investigated binary mixtures showed negative deviations from ideal behavior of the investigated binary systems which can be then discussed in terms of ion-dipole interactions, formation of hydrogen bonds and structural factors. Additionally, the refractive indices measurements and the deviations of refractive index were determined.

Volumetric properties of binary mixtures of 1-ethyl-3-methylimidazolium ethyl phosphonate + methanol or 2-propanol