2-(p-chlorophenylazo)-1-naphthol-4-sulfonic acid is a complex organic compound with the chemical formula C16H11ClN2O3S. It is a derivative of 1-naphthol, featuring a p-chlorophenylazo group attached at the 2-position and a sulfonic acid group at the 4-position. 2-(p-chlorophenylazo)-1-naphthol-4-sulfonic acid is known for its color-changing properties and is often used as a pH indicator, particularly in the field of analytical chemistry. It is also utilized in the synthesis of dyes and pigments due to its ability to form colored complexes with various metal ions. The compound's structure and properties make it a valuable tool in various industrial and scientific applications, including the detection and measurement of pH levels in solutions.

4620-74-0

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Basic information
1. Product Name: 2-(p-chlorophenylazo)-1-naphthol-4-sulfonic acid
2. Synonyms:
3. CAS NO:4620-74-0
4. Molecular Formula:
5. Molecular Weight: 362.793
6. EINECS: N/A
7. Product Categories: N/A
Chemical Properties
1. Melting Point: N/A
2. Boiling Point: N/A
3. Flash Point: N/A
4. Appearance: N/A
5. Density: N/A
6. Refractive Index: N/A
7. Storage Temp.: N/A
8. Solubility: N/A
9. CAS DataBase Reference: 2-(p-chlorophenylazo)-1-naphthol-4-sulfonic acid(CAS DataBase Reference)
10. NIST Chemistry Reference: 2-(p-chlorophenylazo)-1-naphthol-4-sulfonic acid(4620-74-0)
11. EPA Substance Registry System: 2-(p-chlorophenylazo)-1-naphthol-4-sulfonic acid(4620-74-0)
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: 4620-74-0(Hazardous Substances Data)

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Check Digit Verification of cas no

The CAS Registry Mumber 4620-74-0 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,6,2 and 0 respectively; the second part has 2 digits, 7 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 4620-74:
(6*4)+(5*6)+(4*2)+(3*0)+(2*7)+(1*4)=80
80 % 10 = 0
So 4620-74-0 is a valid CAS Registry Number.

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