Question

What happens when nitrous acid is heated?

Answer 1

1. Nitrous acid (${\mathrm{HNO}}_2$) is used to form diazonium salt by the use of amines.
2. When Nitrous acid is heated it is converted to nitrogen dioxide, nitric oxide, and water: ${\mathrm{HNO}}_2\left(\mathrm{aq}\right)\stackrel{∆}{\to }{\mathrm{NO}}_2\left(\mathrm{g}\right)+\mathrm{NO}\left(\mathrm{g}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$