Chrysoine resorcinol
Names | |
---|---|
IUPAC name Sodium 4-[(2,4-dihydroxyphenyl)diazenyl]benzenesulfonate | |
Other names Sodium p-(2,4-dihydroxyphenylazo)benzenesulfonate; Chrysoine; Resorcinol Yellow; Gold Yellow; Yellow T; Tropaeolin O; Tropaeolin R; C.I. Food Yellow 8; C.I. Acid Orange 6; C.I. 14270 | |
Identifiers | |
CAS Number |
|
3D model (JSmol) |
|
ChemSpider |
|
ECHA InfoCard | 100.008.114 |
EC Number |
|
PubChem CID |
|
UNII |
|
CompTox Dashboard (EPA) |
|
InChI
| |
| |
Properties | |
Chemical formula | C12H9N2NaO5S |
Molar mass | 316.26 g·mol−1 |
Appearance | Orange-yellow solid |
Solubility in water | Partially soluble |
Hazards | |
NFPA 704 (fire diamond) | 2 1 0 |
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 |
Chemical compound
Chrysoine resorcinol is a synthetic azo dye which was formerly used as a food additive.[citation needed] In Europe, it was banned as a food additive in 1977.[1] In the US, it was banned in 1988.[2]
Chrysoine resorcinol can be used as a pH indicator with a color change between pH 11 and pH 12.7. In colorimetry, it has an absorption maximum of 387 nm.
Chrysoine resorcinol (pH indicator) | ||
below pH 11.0 | above pH 12.7 | |
11.0 | ⇌ | 12.7 |
Preparation
Acid orange 6 can be synthesised via the azo coupling of sulfanilic acid and resorcinol,
Notes
External links
- Data at inchem.org
- MSDS at Fischer Scientific
- v
- t
- e