Enthalpies of solution,partial molal heat capacities and apparent molal volumes of sugars and polyols in water |
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| Authors: | R V Jasra J C Ahluwalia |
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| Institution: | (1) Department of Chemistry, Indian Institute of Technology, Hauz Khas, 110016 New Delhi, India |
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| Abstract: | Integral enthalpies of solution of some sugars and polyols in water at low concentrations have been determined calorimetrically at 25 and 35°C. These data have been used to derive heat capacities of solution  C°p at 30°C. Partial molal heat capacities C°p,2 have been obtained by combining C°p with C
p,2
*
, the heat capacity of pure solid compounds. Apparent molal volumes have been obtained from density data. The sugars as well as polyols show significantly high positive C°p and C°p,2 values. The results have been explained in terms of a specific hydration model. The effect of substitution of-OH by glycosidic-OCH3 and of-CHOH by deoxy-CH2 are also discussed. |
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| Keywords: | Enthalpy of solution partial molal heat capacity density apparent molal volume sugars polyols specific hydration hydrophobic hydration |
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