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Nitrous acid
Names
IUPAC name
Nitrous acid[1]
Identifiers
CAS Number
7782-77-6Y
3D model (JSmol)
Interactive image
3DMet
B00022
ChEBI
CHEBI:25567Y
ChEMBL
ChEMBL1161681Y
ChemSpider
22936Y
ECHA InfoCard
100.029.057
EC Number
231-963-7
Gmelin Reference
983
KEGG
C00088N
MeSH
Nitrous+acid
PubChem CID
24529
UNII
T2I5UM75DNY
CompTox Dashboard (EPA)
DTXSID7064813
InChI
InChI=1S/HNO2/c2-1-3/h(H,2,3)Y
Key: IOVCWXUNBOPUCH-UHFFFAOYSA-NY
SMILES
O=NO
Properties
Chemical formula
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)
4
0
2
OX
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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Infobox references
Chemical compound
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.
^"Nitrous Acid".
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Nitrousacid (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...
With nitrousacid, sulfamic acid reacts to give nitrogen: HNO2 + H3NSO3 → H2SO4 + N2 + H2O while with concentrated nitric acid, it affords nitrous oxide:...
production of nitrousacid: 2 NaNO 2 + H 2 SO 4 ⟶ 2 HNO 2 + Na 2 SO 4 {\displaystyle {\ce {2NaNO2 + H2SO4 ->2 HNO2 + Na2SO4}}} The nitrousacid then, under...
Nitrous oxide (dinitrogen oxide or dinitrogen monoxide), commonly known as laughing gas, nitrous, nitro, or nos, is a chemical compound, an oxide of nitrogen...
banapple gas. Alkyl nitrites are prepared by the reaction of alcohols with nitrousacid: ROH + HONO → RONO + H2O, where R = alkyl group The reaction is called...
succinic acids. Nitrous oxide is produced in about one to one mole ratio to the adipic acid, as well, via the intermediacy of a nitrolic acid. Related...
compounds produced from the oxidation of NOx which include nitric acid, nitrousacid (HONO), dinitrogen pentoxide (N2O5), peroxyacetyl nitrate (PAN), alkyl...
refers to organic compounds having the –ONO group, which are esters of nitrousacid. Sodium nitrite is made industrially by passing a mixture of nitrogen...
a trans configuration for the resulting acid. It can also be synthesized from hydroxylamine and nitrousacid: NH 2 OH + HNO 2 ⟶ H 2 N 2 O 2 + H 2 O {\displaystyle...
nitrousacid (HNO2), and produces it when mixed with water, although an alternative structure might be anticipated for the true anhydride of nitrous acid...
chamber process for producing sulfuric acid. The compound is the mixed anhydride of sulfuric acid and nitrousacid. In organic chemistry, it is used as...
trichloramine or nitric acid, can also be used to produce hydrazoic acid from hydrazine. Hydrazoic acid reacts with nitrousacid: HN3 + HNO2 → N2O + N2...
Thus, for example, sulfuric acid is H2SO4, and sulfurous acid, H2SO3. Analogously, nitric acid is HNO3, and nitrousacid, HNO2. If there are more than...
acid is a source of nitric oxide complexes, although the details are obscure. Probably relevant is the conventional self-dehydration of nitric acid:...
treated asparagine with nitrousacid, which removed the molecule's amine (–NH2) groups and transformed asparagine into malic acid. This revealed the molecule's...
converts to the amidocarboxylic acid, such as hippuric acid and acetylglycine. With nitrousacid, one obtains glycolic acid (van Slyke determination). With...
nitrousacid and additional acid. Usually the nitrousacid is generated in situ (in the same flask) from sodium nitrite and the excess mineral acid (usually...
fragments produced by enzyme digestion. Nitrousacid can be used to chemically depolymerize heparin/HS. Nitrousacid can be used at pH 1.5 or at a higher...
include 1-butyl nitrite, n-butyl nitrite and nitrousacid butyl ester. It can be prepared by treating nitrousacid (generated in situ) with n-butanol. Butyl...
of nitric acid with HCl or H2SO4 respectively: HNO3 + 3 H2 → NH2OH + 2 H2O Hydroxylamine can also be produced by the reduction of nitrousacid or potassium...
where R represents an alkyl group. Formally they are alkyl esters of nitrousacid. They are distinct from nitro compounds (R−NO2). The first few members...
hot caustic alkalis to benzoic acid and glycine. Nitrousacid converts it into benzoyl glycolic acid, C6H5C(=O)OCH2CO2H. Its ethyl ester reacts with hydrazine...
and more specifically, an alkyl nitrite. It is an ester of hexanol and nitrousacid. It has the structural formula of: CH3(CH2)5ONO The CAS Registry Number...
LiNaNO2 also exists and explodes at 130 °C. Nitroxylic acid might be produced when nitrousacid is reduced by the Eu2+ ion. Sahoo, Balaram; Nayak, Nimai...
analysis. The method exploits the reactivity of nitrousacid derived from acidification of nitrite. Nitrousacid selectively reacts with aromatic amines to...
speeds the conversion of sodium nitrite to nitrite (NO−2) by forming the nitrousacid (HONO) intermediate,[clarification needed] and can improve water-holding...
Demjanov rearrangement is the chemical reaction of primary amines with nitrousacid to give rearranged alcohols.[1][2][3] It involves substitution by a hydroxyl...
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