![Disodium 3-hydroxy-4-[(E)-(2-hydroxy-6-sulfo-3-sulfonato-1-naphthyl)diazenyl]-1-naphthalenesulfonate AldrichCPR](/deepweb/assets/sigmaaldrich/product/structures/338/141/02cdb19c-4f8b-4513-9c78-e1acaf725a9b/640/02cdb19c-4f8b-4513-9c78-e1acaf725a9b.png)
Solution stability studies for products sold as dry dyes are not conducted. The stability of the solution can vary greatly, from being stable for several days, weeks, or even years to failing after a couple of days. It is advisable to prepare the solution fresh and use it on the day of testing. After 1 week, preparing another fresh solution is recommended. Running tests on the freshly prepared solution and previously prepared solutions can help determine their effectiveness over time. If there is any difference between the freshly prepared solution and solutions that were previously prepared, it would provide the necessary insights. This approach is commonly used in research and development to assess solution stability over time.
219916
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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5 G
$64.00
100 G
$262.00
About This Item
Linear Formula:
C20H12N2O11S3Na2
CAS Number:
Molecular Weight:
598.49
MDL number:
UNSPSC Code:
12171500
PubChem Substance ID:
NACRES:
NA.47
Recommended Products
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
application(s)
diagnostic assay manufacturing
hematology
histology
storage temp.
room temp
SMILES string
Oc1cc(c2ccccc2c1N=Nc3c(O)c(cc4cc(ccc34)S(=O)(=O)O[Na])S(=O)(=O)O[Na])S(O)(=O)=O
InChI
1S/C20H14N2O11S3.2Na/c23-15-9-16(35(28,29)30)13-3-1-2-4-14(13)18(15)21-22-19-12-6-5-11(34(25,26)27)7-10(12)8-17(20(19)24)36(31,32)33;;/h1-9,23-24H,(H,25,26,27)(H,28,29,30)(H,31,32,33);;/q;2*+1/p-2
InChI key
WPDDXLRAJOPBIR-UHFFFAOYSA-L
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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]
Signal Word
Warning
Hazard Statements
Precautionary Statements
Hazard Classifications
Eye Irrit. 2
Storage Class Code
11 - Combustible Solids
WGK
WGK 3
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Can solutions of 219916 (Naphthol Blue disodium salt) be prepared in water and kept for several days at room temperature?
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