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596-01-0

alpha-Naphtholphthalein is an organic compound that functions as a pH indicator, exhibiting color changes in response to variations in pH levels. It is characterized by its colorless appearance at a pH of 7.3 and a reddish color at a pH of 8.7, with a greenish to blue hue at a pH of 8.7. This property makes it particularly useful for detecting weak acids in strong alcoholic solutions.

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  • 596-01-0 Structure

  • Basic information

    1. Product Name: alpha-Naphtholphthalein
    2. Synonyms: 3,3-bis(4-hydroxy-1-naphthyl)phthalide;A-NAPHTHOLPHTHALEIN PRACTICAL GRADE;ALPHA-NAPHTHOLPHTHALEIN INDICATOR;1-NAPHTHOLPHTHALEIN, INDICATOR;ALPHA-NAPHTHOLPHTHALEIN(0.1% IN CA. 50% ETHANOL)[FOR PH DETERMINATION];alpha-Naphtholphthalein, indicator, pure;1(3H)-Isobenzofuranone, 3,3-bis(4-hydroxy-1-naphthalenyl)-;à-naphtholphthalein
    3. CAS NO:596-01-0
    4. Molecular Formula: C28H18O4
    5. Molecular Weight: 418.44
    6. EINECS: 209-875-5
    7. Product Categories: Industrial/Fine Chemicals;pharmacetical;Analytical Chemistry;Indicator (pH);pH Indicators;N;Stains and Dyes;Stains&Dyes, A to;Indicators;pH Indicators - Solids;Titration;Phthalein
    8. Mol File: 596-01-0.mol

  • Chemical Properties

    1. Melting Point: 238-240 °C(lit.)
    2. Boiling Point: 496.21°C (rough estimate)
    3. Flash Point: 247.012 °C
    4. Appearance: Pink to beige or brown/Powder
    5. Density: 1.1532 (rough estimate)
    6. Vapor Density: 14.44 (vs air)
    7. Vapor Pressure: 1.44E-20mmHg at 25°C
    8. Refractive Index: 1.6400 (estimate)
    9. Storage Temp.: Store below +30°C.
    10. Solubility: Solubility Practically insoluble in water; soluble in ethanol
    11. PKA: 8.0, 8.2, 8.5(at 25℃)
    12. Water Solubility: Soluble in ethanol. Insoluble in water.
    13. Merck: 14,6389
    14. BRN: 97816
    15. CAS DataBase Reference: alpha-Naphtholphthalein(CAS DataBase Reference)
    16. NIST Chemistry Reference: alpha-Naphtholphthalein(596-01-0)
    17. EPA Substance Registry System: alpha-Naphtholphthalein(596-01-0)

  • Safety Data

    1. Hazard Codes: Xi
    2. Statements: 36/37/38
    3. Safety Statements: 26-36
    4. WGK Germany: 3
    5. RTECS:
    6. HazardClass: N/A
    7. PackingGroup: N/A
    8. Hazardous Substances Data: 596-01-0(Hazardous Substances Data)

596-01-0 Usage

Uses

Used in Chemical Industry:
alpha-Naphtholphthalein is used as a pH indicator in a 0.1% or 0.04% solution in alcohol. It is particularly adapted for detecting weak acids in strong alcoholic solutions due to its color change properties.
Used in Manufacturing and Electronics Industry:
alpha-Naphtholphthalein is used in the preparation of epoxy resin compounds, which are essential for manufacturing laminated boards, printed circuit boards, and other cured products with high heat resistance and flame retardancy. Its incorporation into these materials enhances their performance and safety characteristics.

Check Digit Verification of cas no

The CAS Registry Mumber 596-01-0 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 5,9 and 6 respectively; the second part has 2 digits, 0 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 596-01:
(5*5)+(4*9)+(3*6)+(2*0)+(1*1)=80
80 % 10 = 0
So 596-01-0 is a valid CAS Registry Number.
InChI:InChI=1/C28H18O4/c29-25-15-13-23(17-7-1-3-9-19(17)25)28(22-12-6-5-11-21(22)27(31)32-28)24-14-16-26(30)20-10-4-2-8-18(20)24/h1-16,29-30H

596-01-0 Well-known Company Product Price

  • Brand
  • (Code)Product description
  • CAS number
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  • Alfa Aesar

  • (41221)  alpha-Naphtholphthalein   

  • 596-01-0

  • 1g

  • 368.0CNY

  • Detail

  • Alfa Aesar

  • (41221)  alpha-Naphtholphthalein   

  • 596-01-0

  • 5g

  • 1259.0CNY

  • Detail

  • Alfa Aesar

  • (41221)  alpha-Naphtholphthalein   

  • 596-01-0

  • 25g

  • 4394.0CNY

  • Detail

  • Fluka

  • (33424)  α-Naphtholphthalein  indicator

  • 596-01-0

  • 33424-10G

  • 4,358.25CNY

  • Detail

596-01-0SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 12, 2017

Revision Date: Aug 12, 2017

1.Identification

1.1 GHS Product identifier

Product name alpha-Naphtholphthalein

1.2 Other means of identification

Product number -
Other names 3,3-bis(4-hydroxynaphthalen-1-yl)-2-benzofuran-1-one

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:596-01-0 SDS

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