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) ;
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 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.

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

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.

[2]

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