Abstract
The density measurements have been performed for various monosaccharides and their methyl and deoxy derivatives, and oligo-(di- and tri-) saccharides, in (0.5, 1.0, 1.5 & 2.0) mol·kg−1 aqueous solutions of cosolutes; sodium phosphate (NaH2PO4), and ammonium phosphate (NH4H2PO4) monobasic, and potassium phosphate (K3PO4) tribasic salts at T=(288.15 to 318.15)K at atmospheric pressure. Standard-state partial molar volumes (V2°) and volumes of transfer (∆tV2°) at infinite-dilution, expansion coefficients and interaction coefficients (using the McMillan–Mayer theory of solutions) have been evaluated from the experimental densities. These parameters have been explained on the basis of kosmo-/chaotropic abilities of the studied compounds and interactions between solutes and cosolutes. The present results for the studied solutes have been compared with those reported recently in the presence of potassium phosphate (KH2PO4) monobasic salt. A significant large increase in volumetric parameters has been observed when H2PO4− anions are replaced by PO43− anions.
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