Chemicals and Drugs

Nitrous Acid

Nitrous acid (HNO2). A weak acid that exists only in solution. It can form water-soluble nitrites and stable esters. (From Merck Index, 11th ed)

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

Nitrous acid (HNO2). A weak acid that exists only in solution. It can form water-soluble nitrites and stable esters. (From Merck Index, 11th ed)

Chemical Identity

Chemical Information

Molecular Formula
HNO2
Molecular Weight
47.014 g/mol
CAS Registry No.
7782-77-6
IUPAC Name
nitrous acid
InChIKey
IOVCWXUNBOPUCH-UHFFFAOYSA-N
SMILES
N(=O)O
MeSH Unique ID
D009608
Source
PubChem CID 24529

MeSH Record

Classification

Broader headings

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MeSH Record

Synonyms

1 entry terms
  • Acid, Nitrous

MeSH Record

Aspects Covered

24 allowable subheadings

Indexed with the subheadings administration & dosage, adverse effects, agonists, analysis, antagonists & inhibitors, blood, cerebrospinal fluid, chemical synthesis, chemistry, classification, economics, history, immunology, isolation & purification, metabolism, pharmacokinetics, pharmacology, poisoning, radiation effects, standards, supply & distribution, therapeutic use, toxicity, urine.

MeSH Record

Indexing Annotation

do not confuse with NITRIC ACID

MeSH Record

History Note

91(75); was see under NITRITES 1975-90

MeSH Hierarchy

Tree Numbers

  1. D01w.029w.260.575w
  2. D01w.625w.600w

AMA Style

References

  1. National Library of Medicine. Nitrous Acid. Medical Subject Headings (MeSH). 2026. Unique ID D009608. http://id.nlm.nih.gov/mesh/2026/D009608
  2. Nitrous Acid. In: Wikipedia. https://en.wikipedia.org/wiki/Nitrous_acid
  3. Nitrous Acid. In: Wikidata. https://www.wikidata.org/wiki/Q211891
  4. Nitrous Acid. In: PubChem Compound. CID 24529. https://pubchem.ncbi.nlm.nih.gov/compound/24529