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The molecule of 1,2-ethanediol, like that of water, is capable of forming two hydrogen bonds as a donor of protons. Consequently, the complexes of pyridine and its methyl derivatives with ethanediol may associate in the liquid phase in a similar way as those with water. The association contributes to the excess molar expansion making its isotherms W-shaped for the mixtures with 2-methylpyridine and...