| Alizarine Yellow R (pH indicator) | ||
| below pH 10.1 | above pH 12.0 | |
| 10.1 | ⇌ | 12.0 |
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.
Preparation
Alizarine Yellow R is produced by azo coupling of salicylic acid and diazonium derivative of 4-Nitroaniline
References
- ^ Lide, David R. (25 June 2007). CRC Handbook of Chemistry and Physics, 88th Edition. CRC Press. pp. 3–10. ISBN 9780849304880. OCLC 1024315229.
- ^ "Safety Datasheet (MSDS) for alizarin yellow R". Department of Chemistry, University of Oxford. 2005. Archived from the original on 19 March 2011. Retrieved 11 October 2008.