4-Chloro-5-hydroxynaphthalene-2,7-disulfonic acid CAS 90-21-1
Purity 97%+In StockPharmaceutical Standards
| CAS No. | 90-21-1 |
| Molecular Formula | C10H7ClO7S2 |
| Molecular Weight | 338.74 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
4-Chloro-5-hydroxynaphthalene-2,7-disulfonic acid (CAS 90-21-1) is a pharmaceutical standards certified reference material from CATO. Molecular formula: C10H7ClO7S2. Molecular weight: 338.74 g/mol. ISO 17034 accredited production ensures traceable purity and reliable analytical results.
Physical & Chemical Properties
| Molecular Formula | C10H7ClO7S2 |
| Molecular Weight | 338.74 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
| Halogen Content | Cl-containing |
| Sulfur Atoms | 2 |
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