CHROMOTROPE 2B
Synonym(s):2-(4-Nitrophenylazo)chromotropic acid disodium salt;Acid Red 176
- CAS NO.：548-80-1
- Empirical Formula: C16H12N3NaO10S2
- Molecular Weight: 493.39
- MDL number: MFCD00003951
- EINECS: 208-959-9
- SAFETY DATA SHEET (SDS)
- Update Date: 2025-12-07 19:09:50
What is CHROMOTROPE 2B?
Chemical properties
dark green to dark purple crystalline powder
The Uses of CHROMOTROPE 2B
Chromotrope 2B is a chromotropic acid azo dye and a groundwater pollutant removed from the environment via photoelectrochemical mineralization.
The Uses of CHROMOTROPE 2B
As a dye; as a reagent for boric acid or borates.
Preparation
4-Nitrobenzenamine diazo, and 4,5-Dihydroxynaphthalene-2,7-disulfonic acid?coupling.
Properties and Applications
blue-ray red. Soluble in water for yellow light red, not soluble in alcohol. The strong sulfuric acid for dark purple, diluted into yellow light red solution. In water solution to join hydrochloric acid solution to become yellow, add sodium hydroxide for blue-ray red.
| Standard | Light Fastness | Soaping | Persperation Fastness | Oxygen bleaching | Fastness to seawater | |||
| Fading | Stain | Fading | Stain | Fading | Stain | |||
| ISO | 6-7 | 4 | 4 | 4-5 | ||||
Properties of CHROMOTROPE 2B
| Melting point: | 300 °C |
| form | Crystalline Powder |
| Colour Index | 16575 |
| color | Dark green to dark purple |
| Merck | 14,2240 |
| BRN | 4109733 |
| CAS DataBase Reference | 548-80-1(CAS DataBase Reference) |
| EPA Substance Registry System | 2,7-Naphthalenedisulfonic acid, 4,5-dihydroxy-3-[(4-nitrophenyl)azo]-, disodium salt (548-80-1) |
Safety information for CHROMOTROPE 2B
| Signal word | Warning |
| Pictogram(s) |
 Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation |
| Precautionary Statement Codes |
P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P280:Wear protective gloves/protective clothing/eye protection/face protection. |
Computed Descriptors for CHROMOTROPE 2B
CHROMOTROPE 2B manufacturer
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