Home › Chemicals › Nitrous Acid CAS 598-58-3: Nitrous Acid (HNO2) Identity CAS Number 598-58-3 Molecular Formula HNO2 IUPAC Name nitrous acid Molecular Weight 47.01 g/mol SMILES ON=OSynonyms dinitrogen dioxide, HNO2, nitrous acid
2D Structure
Physical Properties Density 1.45 g/mL at 25°C Boiling Point None°C Melting Point None°C Flash Point None°C Vapor Pressure None kPa at 20°C Refractive Index nD = None Dielectric Constant ε = None
Safety & GHS Classification GHS03 GHS05
H272: May intensify fire; oxidizer H314: Causes severe skin burns and eye damage Storage: Exists only in solution — cannot be isolated. Prepare fresh as needed. Unstable, decomposes to NO and NO2. Use in fume hood with acid-resistant PPE.
Material Compatibility Matrix Plastics Material Rating PTFE Excellent PVC Good PE Good PP Good PEEK Excellent PVDF Good
Rubbers Material Rating Viton Good NBR Severe Effect EPDM Fair Silicone Fair FKM Good
Metals Material Rating Stainless 316 Fair Aluminum Poor Copper Poor Brass Poor
Applications Diazotization reactions (azo dye manufacturing) Nitrosamine formation (laboratory) Corrosion inhibitor in boiler water Meat curing (sodium nitrite generates HNO2) Analytical chemistry reagent Rubber accelerator production External References: PubChem
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