Products Description
What is α-Naphtholphthalein/Alpha-Naphtholphthalein?
α-Naphtholphthalein is also known as Alpha-Naphtholphthalein. It is an organic compound. It is a red crystalline solid. It is insoluble in water at room temperature, but soluble in organic solvents such as ethanol and chloroform. α-Naphtholphthalein is widely used in chemical analysis, especially as an indicator in acid-base titration. It can determine the titration end point of acid and alkali solutions, and judge whether the reaction is completed by the change of color (usually colorless under acidic conditions and red under alkaline conditions).

Basic Information
| Melting point | 238-240 °C(lit.) |
|---|---|
| Boiling point | 496.21°C (rough estimate) |
| bulk density | 350kg/m3 |
| 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 |
| pka | 8.0, 8.2, 8.5(at 25℃) |
| form | Powder |
| color | Pink to beige or brown |
| Odor | Characteristic odour |
| PH | pH : 7.1~8.7 |
Uses
- Acid-base indicator: In chemical analysis, Alpha-Naphtholphthalein is often used as an indicator for acid-base titration. Its color changes with the pH value of the solution and is used to indicate the end point of the reaction.
- Biological stain: In biological experiments, α-Naphtholphthalein can be used as a staining reagent for cells or tissues to assist in observing microstructures (need to be adjusted according to specific experimental conditions).
- Organic synthesis intermediate: α-Naphtholphthalein can also be used to synthesize dyes, drugs or other organic compounds, and participate in condensation, substitution and other reactions through the phenolic hydroxyl group and chromophore group in its structure.
Safety Information
- Alpha-Naphtholphthalein should be avoided from contact with skin and eyes during operation. Measures such as wearing protective gloves and goggles can be taken.
- It should be operated in a well-ventilated place to avoid prolonged inhalation of its vapor.
- α-Naphtholphthalein is a flammable substance and should be stored in a cool, dry, ventilated place, away from fire and oxidants.
- Avoid contact with strong oxidants and strong acids to avoid dangerous reactions.

Company Profile
Gneebio is a professional chemical raw material manufacturer and global distributor. Our company is located in Henan Province, China. We have multiple partner chemical factories in Henan, covering an area of 3,600 square meters, providing customers with a one-stop chemical procurement service, including mixing, repackaging, storage, and distribution.
Our hot-selling products include aromatic hydrocarbons (Naphtha (petroleum), Benzene, Toluene, o-Xylene, Styrene, Cyclohexane, Cyclohexanone, Epsilon-Caprolactam, 2-Anilinoethanol, etc.), alcohols (Ethylene Glycol, 1-Butanol, 2-Methyl-1-Propanol, Ethyl Alcohol, etc.), phenols and ketones (Phenol, Propafenone, Bisphenol A, Phenyl Methacrylate, Methyl Isobutyl Ketone, Phenolic Resin, etc.), and petrochemicals. We hope to establish long-term and mutually beneficial cooperation with more friends in the future and provide the best products and services for our customers.
Please contact us if you need any.




FAQ
1.Are you manufacturers?
A:Yes, we are professional manufacturers in Henan, china since 2021. Welcome to visit our factory for long-termcooperations.
2. How do you ensure your product and service quality?
A:All of our processes strictly adhere to is0 9001 procedures and we are equipped with state of the art quality controlfacilities.
3. How about lead time?
A:Usually, within 10 days, according to the order quantity.
4. How about the payment?
A:We support most mainstream payment methods. T/T, L/c, D/p, D/A, O/A, Cash, Western Union, Money Gram, etc.
5. Can you send free samples?
A:Yes, we can send free samples for most products, Please feel free to send inquiry for specific requests.
6. Do you offer technical supports for the products?
Yes, we have a professional technical support team and can provide unique technical solutions to our clients.
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