A comparison of the excess enthalpies, entropies and free energies of mixing of mixtures of alcohols and of hydrogen peroxide with water shows striking differences in behaviour. For the hydrogen peroxide + water system the values of all the thermodynamic functions are negative, while for the alcohol -t water systems the negative enthalpies are outweighed by much greater entropy contributions which result in positive excess free energies. The partial molal volumes also show differences in behaviour which are ascribed to the interaction between the structures of the two constituents of the mixtures. Basicity data also show a marked contrast in the behaviour of the two types of mixture which is in general agreement with that deduced from the thermodynamic data.
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