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CAS RN: 14979-11-4 | Product Number: A5008

Dimethylsulfonazo III [Spectrophotometric reagent for alkaline earth metals and indicator for the precipitation titration of SO4 with Ba]

  • 2,7-Bis[(4-methyl-2-sulfophenyl)azo]-1,8-dihydroxynaphthalene-3,6-disulfonic Acid
  • 2,7-Bis(2-sulfo-p-tolylazo)-1,8-dihydroxy-3,6-naphthalenedisulfonic Acid
9   11  
13   9  

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Product Number A5008
Molecular Formula / Molecular Weight C__2__4H__2__0N__4O__1__4S__4 = 716.68  
Physical State (20 deg.C) Solid
Packaging and Container 1G-Glass Bottle with Plastic Insert (View image)
CAS RN 14979-11-4
Reaxys Registry Number 7068179
PubChem Substance ID 87563102
MDL Number


Appearance Red to Dark blue to Black powder to crystal
Lambda max. 570.0 to 580.0 nm(H2O)
Absorbance(E1%1cm) min. 400(H2O, 570.0 to 580.0 nm)
Drying loss max. 15.0 %
Ignition residue(Sulfate) max. 7.0 %(after drying)
Sensitiveness Turn Purplish Blue with Barium perchlorate aq and Turn Purple by adding Potassium sulfate aq
Properties (reference)
Maximum Absorption Wavelength 575(H2O) nm
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H.S.code* 2927.00-000
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PubMed Literature

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