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Pharmaceutical Physical Chemistry: Theory and Practices by S. K. Bhasin

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Experiment 10

OBJECT

To determine the partition coefficient of benzoic acid between water and benzene at room temperature and the molecular state of benzoic acid in benzene as compared to its solution in water.

THEORY

If the solute associates in the solvents, the distribution law expressed is

 

images

 

where n is the number of solute molecules which associate in solvent 2.

Benzoic acid exists as normal molecules in water and as dimer in benzene. Therefore, images should be constant. This can be verified experimentally.

APPARATUS REAGENTS REQUIRED

Five reagent ...

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