Volumetric properties of dilute solutions of water in ethanol and water-d2 in ethanol-d1 between T = (278.15 and 318.15) K

Densities of solutions of H2O in C2H5OH and D2O in C2H5OD, with a water mole fraction ranging up to 0.037, were measured with an error of 1.0 · 10−5 g · cm−3 at T = (278.15, 288.15, 298.15, 308.15, and 318.15) K and at atmospheric pressure using a precise sealed vibrating tube densimeter. Apparent molar volumes and isobaric expansibilities down to infinite dilution of a solute were calculated. The temperature-dependent behaviour of solute H/D isotope effects on the volumetric quantities studied was analysed taking account of structure-related peculiarities of the solvating media in question.

Excess limiting apparent molar expansibilities of water in alkanols (closed circles) and water-d2 in alkanols-d1 (open circles).Figure optionsDownload as PowerPoint slideHighlights
► Densities of solutions of H2O in ethanol and D2O in ethanol-d1 were measured.
► Apparent molar volumes and expansibilities for water isotopologues were computed.
► Water expansibilities decrease in protiated system and increase in deuterated one.
► The limiting volume of D2O changes weaker with temperature compared to that of H2O.