Study of dipolar association in polar–polar system of ethyl methyl ketone (EMK) and carboxylic acids vis-à-vis molecular interaction

Dielectric constant of binary mixtures of ethyl methyl ketone (EMK) with some carboxylic acid, namely, acetic acid, propionic acid, and butyric acid, is measured at 303.16 K and 455 kHz. The data are used to compute the mutual correlation factor, gab, excess molar polarization, ΔP, and excess Gibbs free energy, ΔG, of mixing to study the molecular interaction. The study reveals that interaction is maximum in EMK + butyric acid system and microheterogeneous β-clusters with antiparallel orientation of dissimilar molecules predominate in it.