# Distribution law

**Distribution law**

According to Nernst’s Distribution law (1891) or Partition law, *“When a solute is taken up with two immiscible liquids, in both of which the solute is soluble, the solute distributes itself between the two liquids in such a way that the ratio of its concentration in the two liquid phases is constant at a given temperature provided the molecular state of the distributed solute is same in both the phases”.*

I.e.

Where are the concentrations of the solute in two phases. is called distribution coefficient or partition coefficient.

**(A)** When solute undergoes association in one of the solvents, we have

Where ‘n’ =order of association.

**(B) ** When solute undergoes dissociation, we have

Where = on degree of dissociation.

**(C)** When solute is to be extracted from solution by another suitable solvent, we have.

Amount left unextracted =

Where ‘W’ =Initial amount present in solution, ‘V’ =volume of solution, volume of extracting solvent, = Distribution coefficient, ‘n’ = Number of extraction operations.

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