Alizarine Yellow R

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Alizarine Yellow R
Alizarin Yellow R (sodium salt)
Space-filling model of Alizarine Yellow R as a sodium salt
Alizarin Yellow R (acid)
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
3D model (JSmol)
ECHA InfoCard 100.015.457
EC Number 209-536-1
C13H8N3NaO5 (Na salt)
C13H9N3O5 (acid)
Molar mass 309.21 g mol−1 (Na salt)
287.23 g mol−1 (acid)
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 ☑Y☒N ?)
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


  1. ^ Lide, David R. (2008). CRC Handbook of Chemistry and THOT (89th ed.). CRC Press. pp. 3–10. ISBN 978-0-8493-0488-0.
  2. ^