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CAS RN: 525-05-3 | Product Number: N0268

Disodium 1-Nitroso-2-naphthol-3,6-disulfonate Monohydrate

Purity: >98.0%(T)
  • Disodium 3-Hydroxy-4-nitroso-2,7-naphthalenedisulfonate Monohydrate
  • 3-Hydroxy-4-nitroso-2,7-naphthalenedisulfonic Acid Disodium Salt Monohydrate
  • 1-Nitroso-2-naphthol-3,6-disulfonic Acid Disodium Salt Monohydrate
  • Nitroso R Salt Monohydrate
6   ≥20 
2   6  

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Product Number N0268
Purity / Analysis Method >98.0%(T)
Molecular Formula / Molecular Weight C__1__0H__5NNa__2O__8S__2·H__2O = 395.27  
Physical State (20 deg.C) Solid
CAS RN 525-05-3
Reaxys Registry Number 3643930
PubChem Substance ID 87573627
Merck Index (14) 6644
MDL Number


Appearance Light yellow to Yellow to Green powder to crystal
Purity(Neutralization titration) min. 98.0 %(calcd.on anh.substance)
Water 3.0 to 6.0 %
Ignition residue(Sulfate) 35.4 to 39.1 %(calcd.on anh.substance)
Suitability for cobalt-analysis to pass test
Properties (reference)
Solubility in water Soluble
Solubility (slightly sol. in) Ethanol,Methanol
Pictogram Pictogram
Signal Word Warning
Hazard Statements H302 + H312 + H332 : Harmful if swallowed, in contact with skin or if inhaled.
H315 : Causes skin irritation.
H319 : Causes serious eye irritation.
Precautionary Statements P261 : Avoid breathing dust/ fume/ gas/ mist/ vapours/ spray.
P264 : Wash skin thoroughly after handling.
P280 : Wear protective gloves/ protective clothing/ eye protection/ face protection.
P337 + P313 : If eye irritation persists: Get medical advice/ attention.
P302 + P352 + P312 : IF ON SKIN: Wash with plenty of water. Call a POISON CENTER/doctor if you feel unwell.
P304 + P340 + P312 : IF INHALED: Remove person to fresh air and keep comfortable for breathing. Call a POISON CENTER/doctor if you feel unwell.
Related Laws:
EC Number 208-369-1
RTECS# QJ6480000
Transport Information:
HS Number 2908990090
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