Qualitative understanding of partition preferences
Introduction
Cavity modelRules for partitioningThe cavity model in quantitative terms
Selftest
1) What does the cavity model say? Answer 2) Main interactions ... ? Answer 3) Size of a solute molecule ... ? Answer 4) Size of the solvent molecule ... ? Answer 5) Interpretation of data Answer 6) "Like dissolves like" Answer 7) Concept maps 8) Functional groups Answer 9) Illustration by given data? Answer 10) Evaluation of the software PcKocWIN 11) H-bonds between given substances? 12) Tendency to distribute Answer 13) Gas chromatography Answer 
14) Henry's Law constant Answer 15) QuizProblems
Intermolecular interactions in every day life
FAQ14) Henry's Law constant
The Henry´s Law constant, KH, describes the partition equilibrium of a chemical between water and air1. For compounds with a low water solubility the Henry´s Law constant is often derived from the saturation vapour pressure and the water solubility of the compound.
1Note that in physical chemistry the term “Henry´s law constant” is in fact used differently than in environmental chemistry: in physical chemistry it stands for any partition constant between the gas phase and a condensed phase in the linear range of the partition isotherm.
Questions:
1) Can this procedure also be used for compounds...
a)...with relatively high, but still limited, water solubility?b)...that are completely miscible with water?
2) If the compound is a solid at room temperature which data do you use?
a) KH = solubility of the subcooled liquid / saturation vapour pressure of the subcooled liquidb) KH = solubility of the solid / saturation vapour pressure of the subcooled liquid
c) KH = solubility of the subcooled liquid / saturation vapour pressure of the solid
d) KH = solubility of the solid / saturation vapour pressure of the solid
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