Hyponitrous acid
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| Template:Longitem | Template:Unbulleted list |
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| Template:Longitem | 141300 |
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| Template:Longitem | H2N2O2 |
| Molar mass | 62.0282 g/mol |
| Appearance | white crystals |
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Hyponitrous acid is a chemical compound with formula Template:Chem/link or HON=NOH. It is an isomer of nitramide, H2N−NO2, and a formal dimer of azanone, HNO.
Hyponitrous acid forms two series of salts, the hyponitrites containing the [ON=NO]2− anion and the "acid hyponitrites" containing the [HON=NO]− anion.[1]
Structure and properties
There are two possible structures of hyponitrous acid, trans and cis. trans-Hyponitrous acid forms white crystals that are explosive when dry. In aqueous solution, it is a weak acid (pKa1 = 7.21, pKa2 = 11.54),[2] and decomposes to nitrous oxide and water with a half life of 16 days at 25 °C at pH 1–3:
Since this reaction is not reversible, Template:Chem/link should not be considered as the anhydride of Template:Chem/link.[1]
The cis acid is not known,[1] but its sodium salt can be obtained.[3]
Preparation
Hyponitrous acid (trans) can be prepared from silver(I) hyponitrite and anhydrous HCl in ether:
Spectroscopic data indicate a trans configuration for the resulting acid.[3]
It can also be synthesized from hydroxylamine and nitrous acid:
Biological aspects
In enzymology, a hyponitrite reductase is an enzyme that catalyzes the chemical reaction:[4]
References
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