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Kurze Mitteilungen. Physicochemical Studies of Some Nonaqueous Binary Liquid Systems. Pyridine and Propionic Acid

Various physicochemical properties such as electrical conductance, viscosity, surface tension, density, and refractive index of pyridine-propionic acid mixtures with different concentrations have been measured carefully and accurately at 30°C. The properties exhibit an inflexion at a composition of 75 mole per cent of the acid. The observed deviation is attributed to maximum ionization of the acid and the electrostatic interactions of the species present at the above composition and not to complex formation—an idea which conforms to our earlier observations.