Abstract
Densities of highly dilute solutions of protiated and deuterated water in N,N-dimethylformamide and N,N-dimethylacetamide, with the solute mole fractions ranging up to 0.012, were measured with an error of 1.0·10−5·cm3·mol−1 at T=(278.15, 288.15, 298.15, 308.15 and 318.15)K and atmospheric pressure using a precise sealed vibrating-tube densimeter. Apparent molar volumes and apparent molar isobaric expansibilities (down to the infinite dilution) of water isotopologues were calculated. The temperature-dependent behavior of D2OH2O solute isotope effects on the apparent molar quantities under study were described taking into account the structural features of the amide-solvating media compared.
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