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C.I. 13020
Acid Red 2
2-[4-(Dimethylamino)phenylazo]benzoic acid
CAS 493-52-7
Assay 99%min
Packing 25kg/drum
Methyl Red
| Name | Methyl Red |
| Synonyms | C.I. 13020; Acid Red 2 |
| Molecular Structure | ![CAS # 493-52-7, Methyl Red, C.I. 13020, Acid Red 2, 2-[4-(Dimethylamino)phenylazo]benzoic acid](https://www.chemblink.com/structures/493-52-7.gif) |
| Molecular Formula | C15H15N3O2 |
| Molecular Weight | 269.30 |
| CAS Registry Number | 493-52-7 |
| EC Number | 207-776-1 |
Specification:
Item | Specification |
Appearance | Purple crystals with lustre OR reddish-brown powder |
PH ranges | pH 4.5 (red) to pH 6.2 (yellow) |
Quality absorption coefficient α1(λ1,pH 4.5)/(L/cm·g) | ≥130.0 |
Quality absorption coefficient α2(λ2,pH 6.2)/(L/cm·g) | ≥70.0 |
Absorption maximum λ1(pH=4.5)/(L/cm·g) | 523~528 |
Absorption maximum λ2(pH=6.2)/(L/cm·g) | 427~437 |
Solubility in ethanol | Pass |
Residue on ignition(as SO4),% | ≤0.2% |
Loss on drying,% | ≤1.0% |
Uses:
1. Live staining of protozoa.
2. Acid base indicator, pH color change range 4.4 (red) -6.2 (yellow).
3. Titrate ammonia, weak organic bases, and alkaloids, but not applicable to organic acids other than oxalic acid and picric acid.
4. It can be mixed with bromocresol green and methylene blue to form a mixed indicator to
shorten the color gamut and improve the sensitivity of color change.
5. Adsorption indicators for precipitation titration, such as using thorium nitrate to titrate fluoride ions.
6. Verify free chlorine, chlorite and other oxidants.
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