Apparent molar volumes of tartaric acid in water and in aqueous solutions of mono- and disaccharides at 293.15, 303.15, 313.15 and 323.15 K

Department of Chemistry. Agra College, Agra-282 002, Uttar Pradesh, India E-mail : mukhtarsingh2003@rediffmail.com Manuscript received 5 March 2009, revised 20 July 2009, accepted 21 July 2009 Apparent molar volumes (VΦ) have been determined for tartaric acid in water and in aqueous solutions of mono- and disaccharides at different concentrations by measuring the densities at 293.15, 303.15, 313.15 and 323.15 K. The limiting apparent molar volume,VΦ0, (which is equal to the partial molar volume, V20 at infinite dilution) and experimental slope (Sv) have been obtained in each case. The partial molar volumes (V20) have been used to calculate the partial molar volumes of transfer (∆VΦ0) of tartaric acid from water to aqueous solutions of mono- and disaccharides at different temperatures. The values of limiting apparent molar expansibilities (ΦE0) and that of (∂2VΦ0/∂T2)p have been determined from temperature-dependence of VΦ0. The values of pair and triplet coefficients have been determined from ∆VΦ0 It is concluded that tartaric acid behaves as structure maker in water as well as in aqueous solutions of mono- and dlsaccharides