Alizarine Yellow R

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
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
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.017.109
EC Number
  • 209-536-1
UNII
  • 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+; Y
    Key: HXKKTXMJSVFQSL-WPDLWGESSA-M Y
  • 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
  • [Na+].O=C([O-])c1cc(ccc1O)/N=N/c2ccc(cc2)[N+]([O-])=O
Properties
C13H8N3NaO5 (Na salt)
C13H9N3O5 (acid)
Molar mass 309.21 g mol−1 (Na salt)
287.23 g mol−1 (acid)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Harmful
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

References
  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. http://msds.chem.ox.ac.uk/AL/alizarin_yellow_R.html


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