Tags: Chemical Compound, Chemical Substance.
Azo violet is an organic compound with the chemical formula C12H9N3O4. It is used as a dye and a pH indicator.It forms blue colour with magnesium in slightly alkaline medium. This reaction depends on adsorption of the dye on magnesium hydroxide. Ammonium ions reduce sensitivity of reaction.Any salt or salt solution containing magnesium will give this Violet colouring of solution.
