Nitrous acid
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Not to be confused with nitric acid.
"Hono" redirects here. For the place in Sweden, see Hönö.
Nitrous acid (molecular formula HNO
2) is a weak and monoprotic acid known only in solution, in the gas phase, and in the form of nitrite (NO−
2) salts.[2] It was discovered by Carl Wilhelm Scheele, who called it "phlogisticated acid of niter". Nitrous acid is used to make diazonium salts from amines. The resulting diazonium salts are reagents in azo coupling reactions to give azo dyes.
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Nitrous acid[1] | |
Identifiers | |
3D model (JSmol) |
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3DMet | |
ChEBI | |
ChEMBL | |
ChemSpider |
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ECHA InfoCard | 100.029.057 |
EC Number |
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983 | |
KEGG |
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MeSH | Nitrous+acid |
PubChem CID |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
HNO2 | |
Molar mass | 47.013 g/mol |
Appearance | Pale blue solution |
Density | Approx. 1 g/ml |
Melting point | Only known in solution or as gas |
Acidity (pKa) | 3.15 |
Conjugate base | Nitrite |
Hazards | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
Related compounds | |
Other anions |
Nitric acid |
Other cations |
Sodium nitrite Potassium nitrite Ammonium nitrite |
Related compounds |
Dinitrogen trioxide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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