After obtaining the potassium salts of the acids and having freed the same from the excess of the potassium hydroxide and potassium carbonate, the possibilities of the formation of different metallic salts were tried.
The soluble salts of the following metals yielded precipitates:—
The following metallic salts gave a complete precipitation:—
Since the barium and iron (ferric) salts gave the best means of separation, they were used to separate the resins.