Influence of NH4Br on Solvation Behavior of Polyhydroxy Solutes in Aqueous Solutions at Different Temperatures and Atmospheric Pressure

Precise density and viscosity measurements on ternary solutions (polyhydroxy solute + NH4Br + H2O) have been carried out over the temperature range (288.15 to 318.15) K at atmospheric pressure. Partial molar volumes, V2o at infinite dilution and the Jones-Dole B-coefficients obtained from above data were utilized to estimate the transfer parameters (ΔtV2o and ΔtB) for polyhydroxy solutes. The interaction coefficients were obtained from the transfer values using the McMillan-Mayer theory of solutions. Isobaric expansion coefficients and second-order derivatives {(V∂2o/∂T)P, (∂2V2o/∂T2)P}, and dB/dT coefficients were also determined to study the effect of temperature. These parameters were used to understand the kosmo-/chaotropic nature of solutes and cosolute which is helpful in rationalizing the mixing effects due to interactions between them in these solutions, concomitantly keeping the stereochemical differences of the polyhydroxy solutes in view. (Graph Presented). © 2015 American Chemical Society.