New expressions to describe solution nonideal osmotic pressure, freezing point depression, and vapor pressure.

G. D. Fullerton, R. J. Zimmerman, C. Cantu, I. L. Cameron

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

New empirical expressions for osmotic pressure, freezing point depression, and vapor pressure are proposed based on the concepts of volume occupancy and (or) hydration force. These expressions are in general inverse relationships in comparison to the standard ideal expressions for the same properties. The slopes of the new equations are determined by the molecular weight of the solute and known constants. The accuracy and precision of the molecular weights calculated from the slope are identical and approximately 1% for the experiments reported here. The nonideality of all three colligative expressions is described by a dimensionless constant called the solute-solvent interaction parameter I. The results on sucrose have the same I = 0.26 for all three solution properties. The nonideality parameter I increased from 0.26 on sucrose to 1.7 on hemoglobin to successfully describe the well-known nonideal response of macromolecules.

Original languageEnglish (US)
Pages (from-to)1325-1331
Number of pages7
JournalBiochemistry and cell biology = Biochimie et biologie cellulaire
Volume70
Issue number12
DOIs
StatePublished - Dec 1992
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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