Effects of temperature and concentration on interactions in methanol + ethyl acetate and ethanol + methyl acetate or ethyl acetate systems: Insights from apparent molar volume and apparent molar isentropic compressibility study

• We have reported density and speed of sound of binary systems containing an alcohol and an ester.
• The results are discussed in term of intermolecular interaction on the basis of derived properties.
• Redlich–Mayer equation was used to fit the derived results.
• Heplers's constant values were also calculated to know whether the solute acts as structure maker or breaker in solution.

The density (d) and speed of sound (u) for the binary systems (methanol + ethyl acetate) and (ethanol + methyl acetate or ethyl acetate) were measured at 298.15, 303.15, 308.15 and 313.15 K and at atmospheric pressure in this work whereas the system (methanol + methyl acetate) was measured in the literature. The apparent molar volume, VφVφ, isentropic compressibility, ksks, and apparent molar isentropic compressibility, kφkφ, have been calculated using density and speed of sound data, respectively. The limiting apparent molar volume, Vφ0, and limiting apparent molar isentropic compressibility, kφ0, were found by extrapolation to infinite dilution using the Redlich–Mayer equation. The limiting apparent molar volume was used to obtain information about (solute–solvent) and (solute–solute) interactions. The temperature dependence of apparent molar volumes were used to calculate the apparent molar expansibility, Eφ0, and Hepler's constant, (∂2Vφ0/∂T2)P. The isobaric thermal expansion coefficient, αP, was also calculated. Positive kφ0 values for all binary systems can be attributed to the predominance of solvent intrinsic compressibility over the solute intrinsic effect.