Chemical Property of Nitrous Acid
Chemical Property:
- PKA:pK (25°) 3.35
- PSA：49.66000
- Density:1.54±0.1 g/cm3(Predicted)
- LogP:0.14200
- XLogP3:-0.3
- Hydrogen Bond Donor Count:1
- Hydrogen Bond Acceptor Count:3
- Rotatable Bond Count:0
- Exact Mass:47.000728275
- Heavy Atom Count:3
- Complexity:10.3
- Purity/Quality:
-
99% *data from raw suppliers
NITROUS ACID 95.00% *data from reagent suppliers
Safty Information:
- Pictogram(s):
- Hazard Codes:
- MSDS Files:
-
SDS file from LookChem
Useful:
- Chemical Classes:Toxic Gases & Vapors -> Acids, Inorganic
- Canonical SMILES:N(=O)O
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Uses
Nitrous acid is a diazotizing agent. The acid diazotizes primary aromatic amines to diazo derivatives in manufacturing azo dyes. Nitrous acid is a nitrogen oxoacid. It is a conjugate acid of a nitrite. It (as sodium nitrite) is used as part of an intravenous mixture with sodium thiosulfate to treat cyanide poisoning. There is also research to investigate its applicability towards treatments for heart attacks, brain aneurysms, pulmonary hypertension in infants, and Pseudomonas aeruginosa infections. Formation of diazotizing compounds by reaction with primary aromatic amines, source of nitric
oxide.
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Description
Nitrous acid (molecular formula?HNO2) is a weak
and monobasic acid known only in solution and in the
form of nitrite salts. Nitrous acid rapidly decomposes
into nitrogen oxide, nitric oxide and water when in
solution:
2HNO2 ? NO2 + NO+H2O
It can also decompose into nitric acid and nitrous
oxide and water.
4HNO2 ? 2HNO3 +N2O +H2O
Nitric acid (HNO3), also known as “aqua fortis”
and “spirit of nitre”, is a highly corrosive and toxic
strong acid that can cause severe burns. It is colorless
when pure and a slight yellow when “glacial”. Older
samples tend to acquire a yellow cast due to the accumulation
of various oxides of nitrogen. If the solution contains more than 86% nitric acid, it is referred to as
“fuming nitric acid”.
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Physical properties
Pale blue solution; stable only in solution; weak acid, Ka 4.5x10-4.
