Effect of magnesium chloride (2:1 electrolyte) on the aqueous solution behavior of some saccharides over the temperature range of 288.15-318.15 K: a volumetric approach.

摘要: Abstract Infinite-dilution standard partial molar volumes, V 2 0 , for various mono-, di-, and trisaccharides, their derivatives (methyl glycosides) at molalities ranging from 0.04 to 0.12 mol kg−1 in aqueous solutions of magnesium chloride 0.5, 1.0, 2.0, 3.0 mol kg−1, have been evaluated over a range temperatures 288.15 318.15 K by density measurements employing vibrating-tube densimeter. These data utilized determine the corresponding volumes transfer, Δ t saccharides methyl glycosides water solutions. The values found be positive, magnitudes increase with an increasing concentration all cases. Partial expansion coefficients, ( ∂ / T ) P second thereof, estimated. magnitude increases temperature, indicating that hydration effects are strongly sensitive temperature. Pair higher order volumetric interaction coefficients (VAB, VABB) also obtained using McMillan–Mayer theory. parameters discussed terms solute (saccharide or glycoside)–co-solute (magnesium chloride) interactions thus used understand mixing due these interactions. results compared those earlier reported presence electrolytes. An attempt is made interpret properties stereochemistry solutes.