p-Naphtholbenzein
Synonym(s):1-Naphtholbenzein
- CAS NO.：145-50-6
- Empirical Formula: C27H18O2
- Molecular Weight: 374.43
- MDL number: MFCD00078492
- EINECS: 205-656-3
- SAFETY DATA SHEET (SDS)
- Update Date: 2025-01-27 09:38:02
What is p-Naphtholbenzein?
Chemical properties
deep red to rust-coloured crystals
The Uses of p-Naphtholbenzein
alpha-Naphtholbenzein is a pH indicator (pH 0.0-0.8/ pH 8.2-10.0). Dyes and metabolites.
What are the applications of Application
α-Naphtholbenzein is a pH indicator (pH 0.0-0.8/ pH 8.2-10.0)
Properties of p-Naphtholbenzein
| Melting point: | 230-235 °C(lit.) |
| Boiling point: | 463.44°C (rough estimate) |
| Density | 1.0946 (rough estimate) |
| vapor density | 12.9 (vs air) |
| refractive index | 1.4875 (estimate) |
| storage temp. | Store at +5°C to +30°C. |
| solubility | Solubility Insoluble in water; soluble in ethanol, methanol |
| form | Liquid |
| pka | 8.95(at 25℃) |
| color | Pale Red-Brown |
| PH Range | Green (0.0) to yellow (0.8);Yellow (8.2) to green-blue (11.0) |
| Odor | Odorless |
| Water Solubility | insoluble |
| λmax | 210nm |
| BRN | 3471575 |
| Stability: | Stable. Combustible. Incompatible with strong oxidizing agents. |
| CAS DataBase Reference | 145-50-6(CAS DataBase Reference) |
| EPA Substance Registry System | 1(4H)-Naphthalenone, 4-[(4-hydroxy-1-naphthalenyl)phenylmethylene]- (145-50-6) |
Safety information for p-Naphtholbenzein
| Signal word | Warning |
| 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. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P280:Wear protective gloves/protective clothing/eye protection/face protection. 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 p-Naphtholbenzein
| InChIKey | VDDWRTZCUJCDJM-SOYKGTTHSA-N |
p-Naphtholbenzein manufacturer
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