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Discussion

Salts are generally soluble in water. This property makes it possible to separate acidic or basic organic compounds from neutral compounds using liquid-liquid extraction.

In its neutral form 2,6-dichloroindophenol is a weak acid and is colored red when dissolved in an organic solvent. When this indicator is treated in aqueous base it forms a salt and dissolves in the aqueous solution. The salt form, the anion, is blue.

Narrative

In this separatory funnel we have water, the top layer, and chloroform, the bottom layer.

The interface is difficult to see. If we add the acid-base indicator, the sodium salt of 2,6-dichloroindophenol, it turns the water blue indicating that this salt is water soluble.