Methyl yellow
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| Methyl yellow | |
|---|---|
 |
|
| Systematic name | p-dimethylaminoazobenzene |
| Chemical formula | C14H15N3 |
| Molecular mass | 225.289 g/mol |
| Density | x.xxx g/cm3 |
| Melting point | xx.x °C |
| Boiling point | xx.x °C |
| CAS number | [xx-xx-xx] |
| SMILES | CN(C)C(C=C2)=CC=C2N=N C1=CC=CC=C1 |
| Disclaimer and references | |
Methyl yellow, or C.I. 11020, is a chemical compound which may be used as a pH indicator.
| Methyl yellow (pH indicator) | ||
| below pH 2.9 | above pH 4.0 | |
| 2.9 | ↔ | 4.0 |
Synonyms:
- 4-dimethylaminoazobenzene
- p-dimethylaminoazobenzene
- N,N-dimethyl-4-aminoazobenzene
- butter yellow
- methyl yellow
In aqueous solution at low pH, methyl yellow appears red. Between pH 2.9 and 4.0, methyl yellow undergoes a transition, to become yellow above pH 4.0.
Additional indicators are listed in the article on pH indicators.
As "butter yellow" the agent had been used as a food additive before its toxicity was recognized (Opie EL)
[edit] References
- [1]
- Eugene L. Opie. The Pathogenesis of Tumors of the Liver Produced by Butter Yellow. The Journal of Experimental Medicine, Vol 80, 231-246, 1944.
[edit] External links
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