Methyl red
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| Methyl red | |
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| Systematic name | Methyl red |
| Chemical formula | C15H15N3O2 |
| Molecular mass | 269.299 g/mol |
| Density | x.xxx g/cm3 |
| Melting point | 179-182 °C |
| Boiling point | xx.x °C |
| CAS number | [63451-28-5] [845-10-3] (sodium salt) |
| SMILES | CN(C)c2ccc(/N=N/ c1ccccc1C(O)=O)cc2 |
| Disclaimer and references | |
Methyl Red, also called C.I. Acid Red 2, is an indicator dye that turns red in acidic solutions. It is an azo dye, and is a dark red crystalline powder.
Methyl red is a pH indicator; it is red in pH under 4.4, yellow in pH over 6.2, and orange in between.
| Methyl Red (pH indicator) | ||
| below pH 4.4 | above pH 6.2 | |
| 4.4 | ↔ | 6.2 |
In microbiology, methyl red is used in the Methyl Red (MR) Test, used to identify bacteria producing stable acids by mechanisms of mixed acid fermentation of glucose. Cf. Voges-Proskauer (VP) test.
Murexide and methyl red are investigated as promising enhancers of sonochemical destruction of chlorinated hydrocarbon pollutants. [1]
Methyl red is classed by the IARC in group 3 - unclassified as to carcinogenic potential in humans. Its risk phrases are R20 R21 R22 R36 R37 R38 R40.
[edit] See also
[edit] External links
- Nile Chemicals -- Methyl Red A site showing some extra information on methyl red.
- Synthesis of methyl red
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