Hydroxy naphthol blue disodium salt ACS, Sigma-Aldrich®

Supplier: SIGMA-ALDRICH MICROSCOPY
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Synonyms: Hydroxynaphthol blue sodium salt, Hydroxy napthol blue, Sodium (E)-3-hydroxy-4-((2-hydroxy-6-sulpho-3-sulphonatonaphthalen-1-yl)diazenyl)naphthalene-1-sulphonate

M-Clarity™ quality level = MQ200

219916-100G 219916-5G
219916-100GEA 104 GBP
219916-100G 219916-5G
Hydroxy naphthol blue disodium salt ACS, Sigma-Aldrich®
Hydroxy naphthol blue disodium salt

Hydroxy naphthol blue disodium salt, ACS reagent.


Hydroxy naphthol blue disodium salt is a chemical compound belonging to the class of azo dyes commonly used as a pH indicator.It exists as small blue crystals. Hydroxy naphthol blue is suitable for the quantification of metal leaching in metal affinity chromatography. It changes color at pH range 12 to 13 from blue to reddish pink, in the presence of calcium ions and to deep blue in the presence of disodium ethylenediaminetetraacetic acid (EDTA).

Formula: C₂₀H₁₂N₂O₁₁S₃·2Na
MW: 598,479 g/mol
Melting Pt: 274 °C
Density: 2,130 g/cm³
Storage Temperature: Room Temperature
MDL Number: MFCD00004075
CAS Number: 165660-27-5

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Specification Test Results

Appearance (Form) Powder or Crystals or Granules or Chunks
Suitability for Calcium Determination Pass
Meets ACS Requirements Current ACS Specification
Recommended Retest Period 3 Years

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