Tags: Chemical Compound, Chemical Substance.
Peroxynitrous acid (HNO3) is a reactive nitrogen-containing species (RNS). It is the conjugate acid of peroxynitrite (ONOO−). It has a pKa of ~6.8. It is formed in vivo from the diffusion-controlled reaction of nitrogen monoxide (NO·) and superoxide (O2•–). It isomerises with 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.
