Apparent Molar Volume and Viscosity Studies on Some Carbohydrates in Solutions |
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Authors: | Parimal C Dey Muhammad A Motin Tapan K Biswas Entazul M Huque |
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Institution: | (1) Department of Chemistry, University of Rajshahi, Rajshahi-6205, Bangladesh, BD |
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Abstract: | Summary. The apparent molar volume (φv) and viscosity (η) of L(+)-arabinose, D(+)-galactose, D(−)-fructose, D(+)-glucose, sucrose, lactose, and maltose in water and in 0.1% and 0.3% water-Surf Excel solutions were measured as a function
of solute concentrations at 308.15, 313.15, and 323.15 K, respectively. The apparent molar volume (φv) of the carbohydrates was found to be a linear function of the concentration. From a φv versus molality (b) plot, the apparent molar volume at infinite dilution (), which is practically equal to the partial molar volume at infinite dilutions () of these substances was determined. The viscosity coefficients B and D for the carbohydrates were calculated on the basis of the viscosity of the solutions and the solvent using the Jones-Dole equation. The activation free energy for viscous flow (ΔG
≠) of the solutions was also calculated using the Eyring equation. The carbohydrates showed structure making behaviour both in water and in water-Surf Excel solutions. When water-Surf
Excel solutions and pure water solutions containing carbohydrate molecules are compared, the former were found to be more
structured. The behaviour of these solutes in water and in water-Surf Excel solution systems is discussed in the light of
solute–solvent interactions.
Corresponding author. E-mail: chemistry_ru@yahoo.com
Received March 19, 2002; accepted (revised) July 31, 2002
Published online February 24, 2003 |
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Keywords: | , Apparent molar volume, Viscosity coefficient, Activation parameters, Hydrogen bonding, |
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