Azo violet information

Azo violet
Names
	IUPAC name 4-[(E)-(4-Nitrophenyl)diazenyl]benzene-1,3-diol
	Other names (E)-4-[(4-Nitrophenyl)diazenyl]benzene-1,3-diol; 4-(4-Nitrophenyl)azobenzene-1,3-diol; Magneson I; p-Nitrophenylazoresorcinol; 4-Nitrophenylazoresorcinol
Identifiers
CAS Number	74-39-5 ;
3D model (JSmol)	Interactive image; Interactive image;
ChEBI	CHEBI:66930;
ChEMBL	ChEMBL1604790;
ChemSpider	11341372 ;
ECHA InfoCard	100.000.735
EC Number	200-808-5;
PubChem CID	5717413;
UNII	YND5ZT5BS3;
CompTox Dashboard (EPA)	DTXSID30861621 ;
	InChI InChI=1S/C12H9N3O4/c16-10-5-6-11(12(17)7-10)14-13-8-1-3-9(4-2-8)15(18)19/h1-7,16-17H/b14-13+ Key: NGPGYVQZGRJHFJ-BUHFOSPRSA-N ; InChI=1/C12H9N3O4/c16-10-5-6-11(12(17)7-10)14-13-8-1-3-9(4-2-8)15(18)19/h1-7,16-17H/b14-13+ Key: NGPGYVQZGRJHFJ-BUHFOSPRBO;
	SMILES Oc2cc(O)ccc2/N=N/c1ccc(cc1)[N+]([O-])=O; Oc2cc(O)ccc2/N=N/c1ccc(cc1)N(=O)=O;
Properties
Chemical formula	C12H9N3O4
Molar mass	259.318 g mol−1
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 (503.1 °F; 534.8 K)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Azo violet (pH indicator)
below pH 11.0		above pH 13.0
11.0	⇌	13.0

Azo violet (Magneson I;^[1] p-nitrobenzeneazoresorcinol) is an azo compound with the chemical formula C₁₂H₉N₃O₄. It is used commercially as a violet dye and experimentally as a pH indicator, appearing yellow below pH 11, and violet above pH 13.^[2] It also turns deep blue in the presence of magnesium salt in a slightly alkaline, or basic, environment.^[3]^[4] Azo violet may also be used to test for the presence of ammonium ions^{[citation needed]}. The color of ammonium chloride or ammonium hydroxide solution will vary depending upon the concentration of azo violet used. Magneson I is used to test Be also; it produces an orange-red lake with Be(II) in alkaline medium.^[5]

^ "Magneson | C12H9N3O4 | ChemSpider". www.chemspider.com. Retrieved 2022-07-30.
^ "Azo Violet 25GM from Cole-Parmer". Cole-Parmer. Archived from the original on 28 October 2016. Retrieved 28 October 2016.
^ Feigl, F.; Anger, V. (2012-12-02). Spot Tests in Inorganic Analysis. Elsevier. ISBN 9780444597984.
^ Gopalan, R. (2009-01-01). Inorganic Chemistry for Undergraduates. Universities Press. ISBN 9788173716607.
^ Gopalan, R. (2009). Inorganic Chemistry for Undergraduates. Universities Press. ISBN 978-81-7371-660-7.

[1] "Magneson | C12H9N3O4 | ChemSpider". www.chemspider.com. Retrieved 2022-07-30.

[2] "Azo Violet 25GM from Cole-Parmer". Cole-Parmer. Archived from the original on 28 October 2016. Retrieved 28 October 2016.

[3] Feigl, F.; Anger, V. (2012-12-02). Spot Tests in Inorganic Analysis. Elsevier. ISBN 9780444597984.

[4] Gopalan, R. (2009-01-01). Inorganic Chemistry for Undergraduates. Universities Press. ISBN 9788173716607.

[5] Gopalan, R. (2009). Inorganic Chemistry for Undergraduates. Universities Press. ISBN 978-81-7371-660-7.

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