Hydroxy naphthol blue disodium
CAS: 165660-27-5
Ref. 3D-FH52652
| 1kg | 598.00 € | ||
| 2kg | 956.00 € | ||
| 100g | 137.00 € | ||
| 250g | 204.00 € | ||
| 500g | 363.00 € |
Product Information
- 2,2-Dihydroxy-1,1-azonaphthalene-3,4,6-trisulfonic acid disodium salt
- 2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthalenyl)azo]-, disodium salt
- 2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-[2-(2-hydroxy-4-sulfo-1-naphthalenyl)diazenyl]-, sodium salt (1:2)
- Disodium 3-hydroxy-4-(2-hydroxy-4-sulfonaphthalen-1-yl)diazenylnaphthalene-2,7-disulfonate
- Hydroxy naphthol blue
Hydroxy naphtol blue is a synthetic azo dye, characterised for containing the functional group R N=N R. The hydroxy naphtol blue disodium and trisodium salt are used as indicators to determine the content of alkaline earth and lanthanides spectrophotometrically, showing at maximum a wavelength of ~ 650 nm (λmax = 647.6 nm). The best example of the 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 which indicates the endpoint.
Chemical properties
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