Hydroxy naphtol blue is a synthetic azo dye, a chemical compound containing the functional group RN=N-R. The hydroxy naphtol blue trisodium and disodium salts are used as indicators to determine the content of alkaline earth and lanthanides spectrophotometrically, showing at maximum a wavelength of ~650nm (imax = 647.6nm). An example of a common use of hydroxy naphtol blue sodium salt is to determine the hardness of water by measuring the concentration of calcium and magnesium. At alkaline or basic pH, the hydroxy naphtol blue forms a pink/red complex with the metal ions and, after titration with EDTA, hydroxy naphtol blue is liberated, turning the solution blue, indicating the endpoint. Synonyms: 3-Hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthalenyl)azo]-2,7-naphthalenedisulfonic Acid Trisodium Salt CAS No: 63451-35-4 Molecular Formula: C20H11N2Na3O11S3 Molecular Weight: 620.47 Appearance: Blue to black powder 1H-NMR: Conforms to reference Absorptivity: 350 (1%/1cm, Ammonia buffer, pH 12, 2ml 0.05MEDTA, at abs. max.) Solubility: Methanol (Slightly), Water (Slightly) Storage and Stability: May be stored at RT for short-term only. Long-term storage is recommended at -20C. Light Sensitive.
Molekulargewicht:
620.47
CAS Nummer:
[63451-35-4]
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