Abstract
Heats of dilution (q) of various saccharides and their methyl-/deoxy-derivatives (solutes) have been measured in water and in (0.05, 0.15, 0.25 and 0.35) molkg−1 aqueous potassium phosphate monobasic (KH2PO4) solutions at (288.15, 298.15, 308.15, and 318.15) K. Limiting standard enthalpies of dilution (ΔdilH°) for the solutes were calculated from data q measured using isothermal titration micro calorimeter. The speed of sound (u) of solutes was measured in water and in (0.25, 0.50, 1.00 and 1.25) molkg−1 KH2PO4 solutions at (288.15–318.15) K. From these data, the apparent molar isentropic compressibilities (Ks,2,ϕ), interaction coefficients, hydration numbers and transfer parameters (ΔtΔdilH°, ∆tK°s,2) have been calculated. These parameters have been discussed in terms of solute–solvent/cosolute interactions occurring in these solutions. The results suggest that saccharides and their derivatives act as kosmotropes in mixed aqueous solvent.
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