Apparent molar volumes (V_Φ) of mannitol in aqueous solutions of 1-propanol and 2-propanol were obtained from densities of the ternary solutions, accurately measured with a quartz vibrating-tube densimeter at 298.15 K. These data have been used to deduce limiting partial molar volumes of mannitol () and correspondingly limiting partial molar volumes of transfer () from water to different alcohol solutions at different concentrations. The results indicated that influence of 1-propanol on the volumetric property of mannitol in aqueous solution was stronger than that of 2-propanol. The changes of the volumetric properties were discussed in the light of interaction between solute and solvent and the different locations of hydroxyl group in propanol isomers.

Key words: limiting partial molar volume, mannitol, 1-propanol, 2-propanol