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: 2026-01-13 11:12:54
What is alpha-Naphtholphthalein?
Chemical properties
pink to beige or brown fine crystalline powder
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.
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.
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 |
alpha-Naphtholphthalein manufacturer
Megha International
Maharashtra
product: 1 Naphtholphthalein Stain Indicator Powder, Grade: Industrial Grade
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