Azo violet Identifiers Jmol-3D images Image 1 Properties Molecular formula C12H9N3O4 Appearance dark red to brown crystalline powder Density 1.45 g/cm3 Solubility in water 1 g/L H2O; 4 g/L Ethanol Hazards Flash point 261.7 °C (what is: /?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
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. However, ammonium compounds such as ammonium chloride or ammonium hydroxide will give a different colour based on amount used. Still, it is used as identification test for magnesium.
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