Interactions of potassium fluoride with coexistent components in water–dimethyl sulfoxide mixed solvent at different temperatures

Apparent molal volumes (Vφ), apparent molal compressibilities (Kφ) and viscosity A and B-coefficients of potassium fluoride in aqueous solutions of dimethyl sulfoxide (DMSO), have been evaluated at T = 303.15, 308.15, 313.15 and 318.15 K from density, velocity and viscosity data, respectively. The standard partial molal volumes (Vφ0), standard partial molal volumes of transfer (ΔVφ0), standard partial molal compressibilities (Kφ0) and standard partial molal compressibilities of transfer (ΔKφ0) have been determined and interpreted in terms of solute–solvent interactions. Heplerʹs coefficient (∂2Vφ0/∂T2) and variation of B coefficient with temperature (dB/dT) have been interpreted in terms of the structure-making/structure-breaking effects of potassium fluoride in the mixture.