Abstract
A STUDY of the physico-chemical properties of mixtures of pyridine and acetic acid in all proportions ranging from 0 to 100 per cent by various workers and very recently by us1 showed that the equivalent conductivity, viscosity, contraction in volume, and refractive index exhibited in each case a maximum at a composition of 83 mol. per cent of acetic acid. Previous workers ascribed the maxima to the formation of a complex at that composition. A consideration of the dynamics of ionic atmospheres in relation to the effect of an electrolyte dissociating into ions on the viscosity of a solution and other factors (loc. cit.) led us to assume that no compound-formation occurs, and that, instead, at that composition acetic acid attains maximum ionization. At least 17 mol. per cent of pyridine is necessary for complete ionization of acetic acid in pyridine.
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References
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VENKATESAN, V., SURYANARAYANA, C. Super-Acid Formation in the Pyridine–Acetic Acid System. Nature 178, 1345–1346 (1956). https://doi.org/10.1038/1781345a0
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DOI: https://doi.org/10.1038/1781345a0
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