What is Nitrous acid?
[[File:Nitrous acid acsv.svg|thumb|Structure of Nitrous acid]] '''Nitrous acid''' is a [[chemical compound]]. It is a weak [[acid]]. Its chemical formula is HNO<sub>2</sub>. It is unstable. It is made by reacting a strong acid with [[sodium nitrite]]. It is a light blue solution. It breaks down to make [[nitric oxide]], [[nitrogen dioxide]], and water when it is concentrated. Nitrogen dioxide can be reacted with water to make a mixture of nitrous acid and [[nitric acid]]. It is used to make chemicals. ==Related pages== *[[Ammonia]] *[[Nitrous oxide]] {{chem-stub}} [[Category:Acids]] [[Category:Nitrogen compounds]]