Hyponitrous acid forms two series of salts, the " acid hyponitrites " containing [ HON = NO ] " anion and hyponitrites containing the [ ON = NO ] 2 " anion.
2.
Despite appearances, it cannot be considered to be the anhydride of hyponitrous acid ( H 2 N 2 O 2 ) because that acid is not produced by the dissolution of nitrous oxide in water.
3.
Hyponitrous acid is a weak acid ( p " K " a1 = 7.21, p " K " a2 = 11.54 ) in aqueous solution and decomposes to N 2 O and water with a half-life of 16 days at 25 �C at pH 1 3.
4.
Nitroxyl is very reactive towards nucleophiles ( especially thiols ) and quickly dimerizes to hyponitrous acid, H 2 N 2 O 2, which is then dehydrated to nitrous oxide N 2 O . Therefore, HNO is generally prepared " in situ " for example with the compounds such as "'Angeli s salt "'( Na 2 N 2 O 3 ) and "'Piloty s acid "'( PhSO 2 NHOH ) when it is needed.
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