Ethyl red
- CAS NO.：76058-33-8
- Empirical Formula: C17H19N3O2
- Molecular Weight: 297.35
- MDL number: MFCD00002427
- EINECS: 999-999-2
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-09-12 18:49:10
What is Ethyl red?
Chemical properties
dark red powder
The Uses of Ethyl red
Indicator: pH 4.5 (red) to pH 6.5 (yellow)
Purification Methods
Ethyl Red [2-(4-diethylaminophenylazo)benzoic acid] M 297.4, m 135o, 150-1 5 2o, pK1 2.5, pK2 9.5. Crystallise the acid dye from EtOH/diethyl ether or toluene. It is an indicator: pH 4.4 (red) and 6.2 (yellow). UV: max 447nm. [Beilstein 16 I 316.]
Properties of Ethyl red
| Melting point: | 135 °C |
| Boiling point: | 438.86°C (rough estimate) |
| Density | 1.0871 (rough estimate) |
| refractive index | 1.6500 (estimate) |
| solubility | Solubility Almost insoluble in water; slightly soluble in ethanol, soluble in benzene |
| form | powder |
| pka | 5.42(at 25℃) |
| color | Red |
| PH Range | Red (4.5) to yellow (6.5) |
| λmax | 447nm |
| BRN | 3366056 |
| Major Application | Optical materials, photoresists, flexible electronic circuitry, adhesives, textiles, method for counting leukocytes, enzyme binding assays, DNA chips |
| CAS DataBase Reference | 76058-33-8(CAS DataBase Reference) |
Safety information for Ethyl red
| Pictogram(s) |
 Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation |
| Precautionary Statement Codes |
P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P304+P340:IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P405:Store locked up. |
Computed Descriptors for Ethyl red
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