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RAOULT'S LAW, WATER ACTIVITY AND MOISTURE AVAILABILITY IN SOLUTIONS.

Author(s) : CAURIE M.

Type of article: Article

Summary

A RATIONALIZATION OF RAOULT'S LAW HAS LED TO THE CONCLUSION THAT WATER ACTIVITY IS A JOINT SOLUTION PROPERTY OF VAPOUR PRESSURE, SOLUTE AND SOLVENT CONCENTRATIONS. WATER ACTIVITY IS NOT A MEASURE OF THE ABSOLUTE VALUE OF THE MOLE FRACTION OF WATER AS INDICATED BY RAOULT'S LAW BUT A MEASURE OF A FRACTION OF THE MOLE FRACTION OF WATER REMAINING FREE IN SOLUTION AVAILABLE AND UNBOUND TO SOLUTE MOLECULES. THE LAW IS SHOWN TO OVER-ESTIMATE THIS WATER ACTIVITY AT ALL DILUTIONS BY AN AMOUNT EQUAL TO THE PRODUCT OF THE MOLE FRACTION OF SOLUTE AND THE LOWERED RELATIVE VAPOUR PRESSURE THE SOLUTE GENERATES IN SOLUTION.

Details

  • Original title: RAOULT'S LAW, WATER ACTIVITY AND MOISTURE AVAILABILITY IN SOLUTIONS.
  • Record ID : 1984-0494
  • Languages: English
  • Publication date: 1983
  • Source: Source: J. Food Sci.
    vol. 48; n. 2; 1983.03-04; 648-649; 1 fig.; 12 ref.
  • Document available for consultation in the library of the IIR headquarters only.

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