Peroxynitrous acid

Template:Refimprove Template:Chembox Peroxynitrous acid (HNO₃) is a reactive nitrogen species (RNS). It is the conjugate acid of peroxynitrite (ONOO⁻). It has a pK_a of approximately 6.8. It is formed in vivo from the diffusion-controlled reaction of nitrogen monoxide (ON^•) and superoxide (Template:Chem/link). It is an isomer of nitric acid and isomerises with a rate constant of k = 1.2 s⁻¹, a process whereby up to 5% of hydroxyl and nitrogen dioxide radicals may be formed. It oxidises and nitrates aromatic compounds in low yield. The mechanism may involve a complex between the aromatic compound and ONOOH, and a transition from the cis- to the trans-configuration of ONOOH. Peroxynitrous acid is also important in atmospheric chemistry.