Peroxonitric acid, HOONO

Peroxonitrous acid, HOONO. Isomer of nitric acid (HNO2 plus H2O2). 

Peroxonitrous acid, HOONO, is formed as an intermediate in the oxidation of FIN02 to HN03 by H202. Although the acid is unstable, the anion is stable in alkaline solution, imparting a yellow color.34b... 

In the isomerization of peroxonitrous acid, HOONO, to nitric acid the main reaction path involves generation of hydroxyl radicals ... 

HOONO peroxonitrous acid H2Se04 selenic acid... 

HOONO Peroxonitrous acid Unstable, isomeric with nitric acid some salts are more stable ... 

Peroxonitrous Acid and Its Salts. Pcroxonitrous acid HOONO, is an isomer of nitric acid. HNOj, to which it rapidly converts. The half-life of peroxonitrous acid at 0 C is 10 s at 27°C, 0.23 s. It has been known since 1904 that the yellow solution made by mixing nitrous acid and hydrogen peroxide at low temperature contains a stronger oxidant than either ingredient alone, but the chemistry involved was not put on a sound basis until 1994. Additional preparatory methods are also available. 

Peroxonitrous acid is an acid of medium strength (p/fa = 6.8), which rapidly decomposes in neutral conditions (ti/2 = Is at pH = 7.4). Peroxonitrite can isomerize to nitrate or decompose to nitrite and dioxygen. Isomerization to nitrate is a major pathway in acidic media. The mechanism for the decomposition is still in doubt, but it is believed that HOONO homolyzes to give the NO2/OH radical pair. Peroxonitrites are stable in basic solution. Peroxonitrous acid is formed as a yellow intermediate in the reaction of nitrite solutions with hydrogen peroxide that leads to nitrates. 

N2O3 dinitrogen trioxide HOONO peroxonitrous acid... 

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