Nitrous acid is a nitrogen oxoacid.
Definition
Nitrous acid is a nitrogen oxoacid. It is a conjugate acid of a nitrite.
Source: PubChem
US FDA substance register · UNII T2I5UM75DN · registered name NITROUS ACID · single chemical substance
Nitrous Acid is the acid that conforms to the formula:
Cosmetic roles
Draws in and holds moistureHUMECTANTBase that dissolves other ingredientsSOLVENT
Safety & regulatory references
Not classified under Korea’s toxic-substance GHS list · existing chemical substance
More data — names, identifiers, properties, test records, literature
Names & identifiers
NITROUS ACIDINCI나이트러스애씨드Korean label name (MFDS standard)
- CAS No.chemical registry number
- 7782-77-6
- EC No.EU chemical inventory number
- 231-963-7
- DTXSIDUS EPA chemical ID
- DTXSID7064813
- DTXCIDUS EPA compound ID
- DTXCID4048014
- IUPAC
- Nitrous acid
- Molecular formula
- HNO2
- Molecular weight
- 47.013 g/mol
Measured properties
- Appearance
- Exists only in solution, Light blue liquid, [Merck Index] · Solid
- Boiling point
- 320
- Melting point
- 271
- Solubility
- 820g/L
- Dissociation constant
- Weak acid. pK (25 °C): 3.35
- Melting/freezing point
- 195.36 ℃(est.)
- Water solubility
- 47.02 (RTECS)
- Molecular weight
- 138.21 (est.)
Values measured on the substance itself. The KOSHA data are a reference for writing and reviewing safety data sheets, not a specification for a commercial raw material.
Source: PubChem · KOSHA safety data sheets (Korea)
Related literature
- Formation of carcinogens indoors by surface-mediated reactions of nicotine with nitrous acid, leading to potential thirdhand smoke hazards · 2010
- Water Activated by Thermal Atmospheric Plasma of an Electrodeless Microwave Torch, Its Production Conditions and Chemical Composition · 2025
- Formation of nitric oxide from nitrous acid in ischemic tissue and skin. · 2004
- Improved and simple micro assay for sulfated glycosaminoglycans quantification in biological extracts and its use in skin and muscle tissue studies. · 2003
- Interferon‐γ inhibits 35S incorporation in heparan sulfate synthesized by human skin fibroblasts · 1996
Linked databases 17
- ChEBI
- ChEMBL
- EU CosIng ingredient list 2
- Korea Cosmetic Association ingredient dictionary
- Korea toxic substances GHS register (NIER)
- KOSHA safety data sheets (Korea)
- MFDS (Korea) cosmetic ingredient register 2
- NIST Chemistry WebBook
- PubChem 2
- Tlooto literature search 2 3 4 5
- UniChem cross-reference IDs
- US EPA CompTox dashboard
- US EPA DSSTox chemical database
- US FDA substance registration (GSRS)
- US FDA Unique Ingredient Identifier (UNII)
- Wikidata
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