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Some relationships have been found between the infrared spectroscopic properties of water molecules hydrogen bonded to a number of bases in binary liquid mixtures, and the partial eolar excess enthalpies at infinite dilution of water of the solutions. The results suggest a new approach to the use of the well-known Badger-Bauer relationship.

Three-component phase diagrams including tie-lines have been determined at the temperature 298.15 K for {methanol or ethanol or propan-1-ol or propan-2-ol or butan-1-ol or butan-2-ol or 2-methylpropan-1-ol or 2-methylpropan-2-ol + (hept-1-yne + water)}. The results are compared with previously reported results on (an alkanol + heptane + water). The conclusions have a bearing on the water-contamination problem inherent in (petrol + alkanol) blends because petrol does contain unsaturated hydrocarbons and the solubility properties of hept-1-yne in this context are similar to those of petrol.