Acid orange 5
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Names | |
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IUPAC name
Sodium 4-[(E)-(4-anilinophenyl)diazenyl]benzenesulfonate | |
Other names
Fast yellow; Tropaeolin OO | |
Identifiers | |
554-73-4 | |
3D model (Jmol) | Interactive image |
ChemSpider | 10660 |
ECHA InfoCard | 100.008.248 |
PubChem | 11133 |
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Properties | |
C18H14N3NaO3S | |
Molar mass | 375.38 g/mol |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
Infobox references | |
Tropaeolin OO (pH indicator) | ||
below pH 1.4 | above pH 3.2 | |
1.4 | ⇌ | 3.2 |
Acid orange 5 is a compound with formula Na(C6H5NHC6H4N=NC6H4SO3). It is an azo dye. It is also used as a pH indicator; it is red in pH under 1.4, orange-yellow in pH over 3.2.[1]
References
- ↑ Beilstein 16 II 171.
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