NITROUS ACID

한글명:NITROUS ACID

카스 번호7782-77-6

상품명:NITROUS ACID

CBNumberCB4453949

분자식HNO2

포뮬러 무게47.01

MOL 파일7782-77-6.mol

동의어(한글)

아질산

화학적 성질

밀도	1.54±0.1 g/cm3(Predicted)
물리적 상태	용액에서만 안정함
산도 계수 (pKa)	pK (25°) 3.35
색상	stable only in solution
수소이온지수(pH)	3.28(1 mM solution);2.67(10 mM solution);2.13(100 mM solution)
EPA	Nitrous acid (7782-77-6)

위험 및 안전 성명

유해 물질 데이터

7782-77-6(Hazardous Substances Data)

그림문자(GHS)

NITROUS ACID 화학적 특성, 용도, 생산

개요
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”.
화학적 성질
A weak acid occurring only in the form of a light-blue solution.
물리적 성질
Pale blue solution; stable only in solution; weak acid, Ka 4.5x10^-4.
용도
Formation of diazotizing compounds by reaction with primary aromatic amines, source of nitric oxide.
용도
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.
제조 방법
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.
정의
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.
위험도
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.

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