Chemical Applications of the Raman Effect: II. Common Ion Effect

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Abstract
It has been shown by means of the Raman effect that the ionization of homopolar compounds in dilute solution increases more rapidly than is proportional to the dilution. This ionization will be repressed by adding a common ion and such repression is proportional to the concentration of the common ion added. In mixtures of two compounds, both being homopolar and containing a common cation, there is little effect on the ionization. On the addition of a neutral salt containing an anion which may be shared with a cation already combined in homopolar linkage with another anion the equilibrium resulting is in the direction of the formation of that compound whose linkage is the most homopolar. These results indicated by means of the Raman effect cannot be observed with equal facility by any other method of approach.

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