Densimetric and ultrasonic characterization of urea and its derivatives in water
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- 作者：Joanna Krakowiak ; joannak@chem.pg.gda.pl ; Jaros?aw Wawer ; Aneta Panuszko
- 关键词：Density ; Speed of sound ; Apparent molar volume ; Apparent molar isentropic compression ; Urea ; Hydration
- 刊名：Journal of Chemical Thermodynamics
- 出版年：2013
- 出版时间：March, 2013
- 年：2013
- 卷：58
- 期：Complete
- 页码：211-220
- 全文大小：411 K
文摘
The densities at T = (288.15, 293.15, 298.15, 303.15, and 308.15) K and sound velocities at T = 298.15 K have been measured for aqueous solutions of urea, N-methylurea, N,N¡¯-dimethylurea, N,N,N¡¯N¡¯-tetramethylurea, N-ethylurea, N,N¡¯-diethylurea, N-butylurea. From these data the apparent molar volumes, V¦µ the apparent molar isentropic compressions, KS,¦µ, and the Passynski solvation numbers of solutes have been determined. The concentration dependencies of the calculated quantities and their limiting values are discussed in terms of solute-solvent and solute-solute interactions.