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219916

Sigma-Aldrich

Hydroxy naphthol blue disodium salt

ACS reagent

Synonym(s):

disodium;3-hydroxy-4-[(2-hydroxy-4-sulfonatonaphthalen-1-yl)diazenyl]-7-sulfonaphthalene-2-sulfonate

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About This Item

Linear Formula:
C20H12N2O11S3Na2
CAS Number:
Molecular Weight:
598.49
MDL number:
UNSPSC Code:
12171500
PubChem Substance ID:
NACRES:
NA.47

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grade

ACS reagent

Quality Level

form

powder, crystals or granules

technique(s)

titration: suitable

pH

7.9

mp

274 °C

solubility

water: soluble

density

2.130 g/cm3

λmax

650 nm

suitability

passes test for determination of calcium

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General description

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 12-13 from blue to reddish pink, in the presence of calcium ions and to deep blue in the presence of disodium ethylenediaminetetraacetic acid (EDTA).[1]

Pictograms

Exclamation mark

Signal Word

Warning

Hazard Statements

Hazard Classifications

Eye Irrit. 2

Storage Class Code

11 - Combustible Solids

WGK

WGK 3


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