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Alizarine Yellow R
Chemical compound / From Wikipedia, the free encyclopedia
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.
Quick Facts Names, Identifiers ...
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Names | |
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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) |
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ChemSpider |
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ECHA InfoCard | 100.017.109 ![]() |
EC Number |
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PubChem CID |
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UNII |
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CompTox Dashboard (EPA) |
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Properties | |
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: | |
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Warning | |
H302, H319 | |
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).
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Alizarine Yellow R (pH indicator) | ||
below pH 10.1 | above pH 12.0 | |
10.1 | ⇌ | 12.0 |