Methyl Red sodium salt
Synonym(s):2-[(4-Dimethylamino)phenylazo]benzoic acid sodium salt, 4-(Dimethylamino)azobenzene-1,2′-carboxylic acidsodium salt;4-Dimethylaminoazobenzene-2′-carboxylic acid sodium salt;Acid Red 2;Methyl red sodium salt (C.I. 13020)
- CAS NO.：845-10-3
- Empirical Formula: C15H16N3NaO2
- Molecular Weight: 293.3
- MDL number: MFCD00002426
- EINECS: 212-682-9
- SAFETY DATA SHEET (SDS)
- Update Date: 2023-05-04 15:15:10
What is Methyl Red sodium salt?
Chemical properties
orange powder
The Uses of Methyl Red sodium salt
Methyl Red sodium salt is used as a pH indicator. In microbiology, it is used to make agar plates in bacteriology. Further, it is used as a coloring agent and also finds use in mouthwash, toothpaste and in cosmetics. It is also employed as a rocket propellant. In addition to this, it is used in the preparation of reversible stain for rapid detection of stained cells in each specimen.
What are the applications of Application
Methyl Red sodium salt is a dye used for pH detection
General Description
Methyl red sodium salt is the sodium salt of methyl red synthetic dye, which belongs to the azo group of dyes.
Biochem/physiol Actions
Methyl Red is a pH indicator and it changes color at a pH of 5.5.
Purification Methods
It can be precipitated from aqueous solution as the free acid which is recrystallised from 95% EtOH, then reconverted to the sodium salt. In H2O it is pink at pH 4.2 and yellow at pH 6.2 and has at 437nm.
Properties of Methyl Red sodium salt
| Melting point: | 178-182 °C |
| Boiling point: | 64.7 °C |
| Density | 0.791 |
| Flash point: | 12 °C |
| storage temp. | Store at +5°C to +30°C. |
| solubility | H2O: soluble |
| pka | 2.3, 5.0(at 25℃) |
| form | Solid |
| Colour Index | 13020 |
| color | White to yellow or beige, darkening on exposure to light |
| PH | 8.2 (10g/l, H2O, 25℃) |
| PH Range | Red (1.2) to orange (3.4);Red (4.2) to yellow (6.3) |
| Odor | Odorless |
| Water Solubility | Soluble in water. Slightly soluble in ethanol. |
| λmax | 437nm, 410nm, 493nm |
| BRN | 4065488 |
| Stability: | Reported to be unstable, but this is probably a mistake on a commercial MSDS sheet. Incompatible with strong oxidizing agents. |
| Major Application | optical fibers, liquid crystal cells, holography, inks, toner, corrosion inhibitor, detergent |
| CAS DataBase Reference | 845-10-3(CAS DataBase Reference) |
| EPA Substance Registry System | Benzoic acid, 2-[[4-(dimethylamino)phenyl]azo]-, sodium salt (845-10-3) |
Safety information for Methyl Red sodium salt
Computed Descriptors for Methyl Red sodium salt
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product: 845-10-3 Methyl Red Sodium Salt (water soluble) 99%
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