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The effects of 1-propanol, 2-propanol, NaCl, urea, and [beta]-D-fructose on the molecular organization of water To, Eric Chun Hin
Abstract
Excess partial molar enthalpies of 1-propanol, HIP[sup E], were measured directly and accurately in four ternary aqueous systems by titrating small increments of 1 -propanol into mixtures comprised of 1-propanol, H₂O, and a "third component" at 25°C. Firstly, in the 1-propanol - H₂O - 2-propanol mixtures, the enthalpic interaction function between 1-propanol molecules, H[sub 1P1P][sup E] , were evaluated. Based on the knowledge accumulated in our laboratory on the mixing behaviour of each solute on the hydrogen bond network of water, the result indicates that 1 -propanol and 2-propanol modify the molecular organization of water in an identical and additive manner. Secondly, in the 1 -propanol - H₂O - NaCl mixtures, the enthalpic interaction function suggests that though NaCl acts as a structure breaker, it also modifies the hydrogen bond network of water in a positively cooperative manner with 1-propanol, a relatively hydrophobic solute. However, the results also suggest that a NaCl molecule binds to 7 to 8 water molecules, which were made unavailable for 1-propanol to interact with. The remaining bulk water away from solute NaCl would interact with 1-propanol as it is pure water. Thirdly, in the 1-propanol- H₂O -Urea mixtures, the total vapour pressures of this ternary system were measured in addition to H[sub 1P][ sup E]. The Boissonnass method based on the Gibbs-Duhem relation were employed to calculate the partial pressures, excess chemical potentials of each component. Excess partial molar entropies of 1-propanol were then evaluated. Both enthalpic and entropic interaction functions imply that urea molecules blend themselves into the hydrogen bond network of water keeping the connectivity of the hydrogen bonds intact but concurrently the water mediated solute-solute interaction is reduced. Finally, the interactions of 1P-1P in terms of enthalpy and entropy, H[sub 1P1P][sup E] and S[sub 1P1P][sup E], respectively, in 1-propanol-H₂0-β-D-Fructose mixtures suggest that fructose and 1- propanol modify the hydrogen bond network of water in a positively cooperative manner, much like the 1-propanol-H₂O-Glycerol systems studied previously. However the different appearances in the interaction functions of fructose as compared to other solutes suggests that the solvation of fructose might involve different mixing mechanisms which are yet to be determined.
Item Metadata
Title |
The effects of 1-propanol, 2-propanol, NaCl, urea, and [beta]-D-fructose on the molecular organization of water
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1999
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Description |
Excess partial molar enthalpies of 1-propanol, HIP[sup E], were measured directly and
accurately in four ternary aqueous systems by titrating small increments of 1 -propanol
into mixtures comprised of 1-propanol, H₂O, and a "third component" at 25°C. Firstly, in
the 1-propanol - H₂O - 2-propanol mixtures, the enthalpic interaction function between
1-propanol molecules, H[sub 1P1P][sup E] , were evaluated. Based on the knowledge accumulated in
our laboratory on the mixing behaviour of each solute on the hydrogen bond network of
water, the result indicates that 1 -propanol and 2-propanol modify the molecular
organization of water in an identical and additive manner. Secondly, in the 1 -propanol -
H₂O - NaCl mixtures, the enthalpic interaction function suggests that though NaCl acts
as a structure breaker, it also modifies the hydrogen bond network of water in a positively
cooperative manner with 1-propanol, a relatively hydrophobic solute. However, the
results also suggest that a NaCl molecule binds to 7 to 8 water molecules, which were
made unavailable for 1-propanol to interact with. The remaining bulk water away from
solute NaCl would interact with 1-propanol as it is pure water. Thirdly, in the 1-propanol-
H₂O -Urea mixtures, the total vapour pressures of this ternary system were measured in
addition to H[sub 1P][ sup E]. The Boissonnass method based on the Gibbs-Duhem relation were
employed to calculate the partial pressures, excess chemical potentials of each
component. Excess partial molar entropies of 1-propanol were then evaluated. Both
enthalpic and entropic interaction functions imply that urea molecules blend themselves
into the hydrogen bond network of water keeping the connectivity of the hydrogen bonds
intact but concurrently the water mediated solute-solute interaction is reduced. Finally,
the interactions of 1P-1P in terms of enthalpy and entropy, H[sub 1P1P][sup E] and S[sub 1P1P][sup E],
respectively, in 1-propanol-H₂0-β-D-Fructose mixtures suggest that fructose and 1-
propanol modify the hydrogen bond network of water in a positively cooperative manner,
much like the 1-propanol-H₂O-Glycerol systems studied previously. However the
different appearances in the interaction functions of fructose as compared to other solutes
suggests that the solvation of fructose might involve different mixing mechanisms which
are yet to be determined.
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Extent |
3323457 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-06-15
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0061507
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1999-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.