An important quantitative relation which holds in heterogeneous systems is the partition (or distribution) law, enunciated by Berthelot and E. C. Jungfleisch.1 This states that a solute distributes itself between two immiscible (e.g. water and benzene) or partially miscible (e.g. water and ether) solvents in such a way that the ratio of its concentrations in each at a particular temperature is constant: c1/c2 = k. Some apparent exceptions were shown independently by Nernst2 and Aulich3 to depend on the different molecular weights of the solute in the two solvents.
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