alpha-Naphtholphthalein
Synonym(s):1-Naphtholphthalein
- CAS NO.：596-01-0
- Empirical Formula: C28H18O4
- Molecular Weight: 418.44
- MDL number: MFCD00036202
- EINECS: 209-875-5
- SAFETY DATA SHEET (SDS)
- Update Date: 2024-06-14 12:24:17
What is alpha-Naphtholphthalein?
Chemical properties
pink to beige or brown fine crystalline powder
The Uses of alpha-Naphtholphthalein
alpha-Naphtholphthalein is used in preparation of epoxy resin compound, preparing, laminated board, printed circuit board, and cured product with high heat resistance and flame retardancy.
The Uses of alpha-Naphtholphthalein
As indicator in 0.1% or 0.04% solution in alcohol. pH 7.3 colorless to reddish; 8.7 greenish to blue. Particularly adapted for weak acids in strong alcoholic solution.
What are the applications of Application
α-Naphtholphthalein is a useful pH indicator between 7.3–8.7
Properties of alpha-Naphtholphthalein
| Melting point: | 238-240 °C(lit.) |
| Boiling point: | 496.21°C (rough estimate) |
| Density | 1.1532 (rough estimate) |
| vapor density | 14.44 (vs air) |
| refractive index | 1.6400 (estimate) |
| storage temp. | Store below +30°C. |
| solubility | Solubility Practically insoluble in water; soluble in ethanol |
| form | Powder |
| pka | 8.0, 8.2, 8.5(at 25℃) |
| color | Pink to beige or brown |
| Odor | Characteristic odour |
| PH Range | 7.1(brownish)-8.3(blue/green) |
| PH | pH : 7.1～8.7 |
| Water Solubility | Soluble in ethanol. Insoluble in water. |
| λmax | 648nm |
| Merck | 14,6389 |
| BRN | 97816 |
| CAS DataBase Reference | 596-01-0(CAS DataBase Reference) |
Safety information for alpha-Naphtholphthalein
| 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. 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 alpha-Naphtholphthalein
| InChIKey | HQHBAGKIEAOSNM-UHFFFAOYSA-N |
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