Alizarine Yellow R

Alizarine Yellow R
Names
	IUPAC name Sodium 2-hydroxy-5-[(E)-(4-nitrophenyl)diazenyl]benzoate
	Other names 5-[(p-Nitrophenyl)azo]salicylic acid sodium salt; Chrome orange; Mordant orange 1; C.I. 14030
Identifiers
CAS Number	1718-34-9 (Na salt) ; 2243-76-7 (acid)[1] ;
3D model (JSmol)	Interactive image;
ChemSpider	17215762 ;
ECHA InfoCard	100.017.109
EC Number	209-536-1;
PubChem CID	6504724 (Na salt);
UNII	Y1YL31LOKF;
CompTox Dashboard (EPA)	DTXSID1033163 ;
	InChI InChI=1S/C13H9N3O5.Na/c17-12-6-3-9(7-11(12)13(18)19)15-14-8-1-4-10(5-2-8)16(20)21;/h1-7,17H,(H,18,19);/q;+1/p-1/b15-14+; Key: HXKKTXMJSVFQSL-WPDLWGESSA-M ; InChI=1/C13H9N3O5.Na/c17-12-6-3-9(7-11(12)13(18)19)15-14-8-1-4-10(5-2-8)16(20)21;/h1-7,17H,(H,18,19);/q;+1/p-1/b15-14+; Key: HXKKTXMJSVFQSL-QUIZLSBABP;
	SMILES [Na+].O=C([O-])c1cc(ccc1O)/N=N/c2ccc(cc2)[N+]([O-])=O;
Properties
Chemical formula	C13H8N3NaO5 (Na salt); C13H9N3O5 (acid)
Molar mass	309.21 g mol−1 (Na salt) ; 287.23 g mol−1 (acid)
Hazards
Main hazards	Harmful
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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	Infobox references

Alizarine Yellow R is a yellow colored azo dye made by the diazo coupling reaction. It usually comes as a sodium salt. In its pure form it is a rust-colored solid.[2] Its main use is as a pH indicator.

Alizarine Yellow R (pH indicator)
below pH 10.1		above pH 12.0
10.1	⇌	12.0

References

Lide, David R. (2008). CRC Handbook of Chemistry and Physics (89th ed.). CRC Press. pp. 3–10. ISBN 978-0-8493-0488-0.
http://msds.chem.ox.ac.uk/AL/alizarin_yellow_R.html

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[CRC-1] Lide, David R. (2008). CRC Handbook of Chemistry and Physics (89th ed.). CRC Press. pp. 3–10. ISBN 978-0-8493-0488-0.

[2] ttp://msds.chem.ox.ac.uk/AL/alizarin_yellow_R.html