NITROUS ACID
![NITROUS ACID Structure](CAS/20180906/GIF/7782-77-6.gif)
- CAS No.
- 7782-77-6
- Chemical Name:
- NITROUS ACID
- Synonyms
- HNO2;HONO;nitrousaci;NITROUS ACID;kyselinadusite;Kyselina dusite;Nitrosyl hydroxide;Nitrous acid, trans
- CBNumber:
- CB4453949
- Molecular Formula:
- HNO2
- Molecular Weight:
- 47.01
- MOL File:
- 7782-77-6.mol
- Modify Date:
- 2023/10/17 17:11:48
Density | 1.54±0.1 g/cm3(Predicted) |
---|---|
form | stable only in solution |
pka | pK (25°) 3.35 |
color | stable only in solution |
PH | 3.28(1 mM solution);2.67(10 mM solution);2.13(100 mM solution) |
EPA Substance Registry System | Nitrous acid (7782-77-6) |
SAFETY
Risk and Safety Statements
Symbol(GHS) | ![]() GHS05 |
---|---|
Signal word | Danger |
Hazard statements | H314 |
Precautionary statements | P260-P264-P280-P301+P330+P331-P303+P361+P353-P363-P304+P340-P310-P321-P305+P351+P338-P405-P501 |
NITROUS ACID Chemical Properties,Uses,Production
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”.
Chemical Properties
A weak acid occurring only in the form of a light-blue solution.
Physical properties
Pale blue solution; stable only in solution; weak acid, Ka 4.5x10-4.
Uses
Formation of diazotizing compounds by reaction with primary aromatic amines, source of nitric oxide.
Uses
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.
Preparation
Nitrous acid may be obtained in solution by adding a strong acid to nitrite; e.g., adding hydrochloric acid to sodium nitrite solution:
H+ + NO2 ˉ → HNO2.
Definition
A weak acid known only in solution, obtained by acidifying a solution of a nitrite. It readily decomposes on warming or shaking to nitrogen monoxide and nitric acid. The use of nitrous acid is very important in the dyestuffs industry in the diazo reaction: nitrous acid is liberated by acidifying a solution of a nitrite (usually sodium nitrite) in the presence of the compound to be diazotized. Nitrous acid and the nitrites are normally reducing agents but in certain circumstances they can behave as oxidizing agents, e.g. with sulfur dioxide and hydrogen sulfide.
Hazard
Rapidly forms nitric oxide and nitric acid in water; [Merck Index] A strong oxidizer; Causes burns; Highly toxic by ingestion and inhalation.
Safety Profile
Mutation data reported. Flammable by chemical reaction; a powerful oxidizer. Explodes on contact with phosphorus trichloride. Reacts violently with PH3 and Pcb. Reactions with l-amino- 5-nitrophenol, ammonium decahydroborate(2-), hydrazine (product is hydrogen azide) may give explosive products. Incompatible with anilines (e.g., 4- bromoahe , 2-chloroaniline, 3- chloroaniline, 2-nitroadine, 3-nitroaniline, 4-nitroaniline, aniline ), semicarbazone, silver nitrate. When heated to decomposition it emits hghly toxic fumes of NOx. See also NITRIC OXIDE.
NITROUS ACID Preparation Products And Raw materials
Raw materials
Preparation Products
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