Nitrous oxide
Laboratory methods

The decomposition of ammonium nitrate is also a common laboratory method for preparing the gas. Equivalently, it can be obtained by heating a mixture of sodium nitrate and ammonium sulfate:

Another method involves the reaction of urea, nitric acid and sulfuric acid:

Direct oxidation of ammonia with a manganese dioxide - bismuth oxide catalyst has been reported: cf. Ostwald process.

Hydroxylammonium chloride reacts with sodium nitrite to give nitrous oxide. If the nitrite is added to the hydroxylamine solution, the only remaining by-product is salt water. If the hydroxylamine solution is added to the nitrite solution (nitrite is in excess), however, then toxic higher oxides of nitrogen also are formed:

Treating HNO with SnCl and HCl also has been demonstrated:

Hyponitrous acid decomposes to N O and water with a half-life of 16 days at 25 °C at pH 1–3.
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