Naphtholphthalein, also known as sodium 2-(1-naphthyl)phenol-6,8-disulfonate, is a synthetic organic compound that belongs to the class of phthalein dyes. It is a colorless, water-soluble substance that turns pink to purple in alkaline solutions, making it a useful pH indicator. The chemical structure of naphtholphthalein consists of a naphthalene ring and a phenol ring connected by a disulfonate group, which imparts its color-changing properties. It is commonly used in various applications, such as in the determination of the endpoint in titrations, in the detection of alkaline substances, and in the manufacturing of colorants for textiles and plastics.

1301-55-9

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Basic information
1. Product Name: Naphtholphthalein
2. Synonyms: 3,3-Bis(hydroxynaphthyl)phthalide
3. CAS NO:1301-55-9
4. Molecular Formula: C28H18 O4
5. Molecular Weight: 0
6. EINECS: N/A
7. Product Categories: N/A
8. Mol File: 1301-55-9.mol
Chemical Properties
1. Melting Point: N/A
2. Boiling Point: N/A
3. Flash Point: N/A
4. Appearance: /
5. Density: N/A
6. Refractive Index: N/A
7. Storage Temp.: N/A
8. Solubility: N/A
9. CAS DataBase Reference: Naphtholphthalein(CAS DataBase Reference)
10. NIST Chemistry Reference: Naphtholphthalein(1301-55-9)
11. EPA Substance Registry System: Naphtholphthalein(1301-55-9)
Safety Data
1. Hazard Codes: N/A
2. Statements: N/A
3. Safety Statements: N/A
4. WGK Germany:
5. RTECS:
6. HazardClass: N/A
7. PackingGroup: N/A
8. Hazardous Substances Data: 1301-55-9(Hazardous Substances Data)

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Check Digit Verification of cas no

The CAS Registry Mumber 1301-55-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,3,0 and 1 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 1301-55:
(6*1)+(5*3)+(4*0)+(3*1)+(2*5)+(1*5)=39
39 % 10 = 9
So 1301-55-9 is a valid CAS Registry Number.

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