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Alizarine Yellow R
	Alizarin Yellow R (sodium salt)
	Alizarin Yellow R (acid)
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) ;
3D model (JSmol)	Interactive image;
ChemSpider	17215762 ;
ECHA InfoCard	100.017.109
EC Number	209-536-1;
PubChem CID	6504724 (Na salt);
UNII	R1T3O0G585 (Na salt) ; OBF2VZO457 (acid) ;
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)
HazardsSigma-Aldrich Co., ALIZARINE YELLOW R. Retrieved on 09 April 2023.
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H319
Precautionary statements	P264, P270, P280, P301+P312, P305+P351+P338, P330, P337+P313, P501
	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

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

Alizarine Yellow R is a yellow colored azo dye made by the diazo coupling reaction. It is usually commercially available as a sodium salt. In its pure form, it is a rust-colored solid.^[2] It is mainly used as a pH indicator.

Preparation

Alizarine Yellow R is produced by azo coupling of salicylic acid and diazonium derivative of 4-Nitroaniline

References

^ Lide, David R. (25 June 2007). CRC Handbook of Chemistry and Physics, 88th Edition. CRC Press. pp. 3–10. ISBN 9780849304880. OCLC 1024315229.
^ "Safety Datasheet (MSDS) for alizarin yellow R". Department of Chemistry, University of Oxford. 2005. Archived from the original on 19 March 2011. Retrieved 11 October 2008.

External links

Alizarin Yellow R at Sigma Aldrich

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[CRC-1] Lide, David R. (25 June 2007). CRC Handbook of Chemistry and Physics, 88th Edition. CRC Press. pp. 3–10. ISBN 9780849304880. OCLC 1024315229.

[2] "Safety Datasheet (MSDS) for alizarin yellow R". Department of Chemistry, University of Oxford. 2005. Archived from the original on 19 March 2011. Retrieved 11 October 2008.

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