Alizarine Yellow R
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Alizarine Yellow R
| Alizarine Yellow R | |
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Other names
5-[(p-nitrophenyl)azo]salicylic acid sodium salt |
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| Identifiers | |
| CAS number | 1718-34-9  , (Na salt)2243-76-7 (acid)[1] |
| ChemSpider | 17215762 |
| Jmol-3D images | Image 1 |
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| Properties | |
| Molecular formula | C13H8N3NaO5 (Na salt) C13H9N3O5 (acid) |
| Molar mass | 309.21 g mol−1 (Na salt) 287.23 g mol−1 (acid) |
| Hazards | |
| Main hazards | Harmful |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| 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]
Special properties
Alizarine Yellow R is a pH indicator.
| Alizarine Yellow R (pH indicator) | ||
| below pH 10.1 | above pH 12.0 | |
| 10.1 | ↔ | 12.0 |
References
- ^ Lide, David R. (2008). CRC Handbook of Chemistry and Physics, 89th Edition. CRC Press. pp. 3–10. ISBN 978-0-8493-0488-0.
- ^ http://msds.chem.ox.ac.uk/AL/alizarin_yellow_R.html
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