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Dinitrogen tetroxide
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===Intermediate in the manufacture of nitric acid=== Nitric acid is manufactured on a large scale via N<sub>2</sub>O<sub>4</sub>. This species reacts with water to give both [[nitrous acid]] and [[nitric acid]]: : N<sub>2</sub>O<sub>4</sub> + H<sub>2</sub>O β HNO<sub>2</sub> + HNO<sub>3</sub> The coproduct HNO<sub>2</sub> upon heating [[Disproportionation|disproportionates]] to [[Nitric oxide|NO]] and more nitric acid. When exposed to oxygen, NO is converted back into nitrogen dioxide: : 2 NO + O<sub>2</sub> β 2 NO<sub>2</sub> The resulting NO<sub>2</sub> and N<sub>2</sub>O<sub>4</sub> can be returned to the cycle to give the mixture of nitrous and nitric acids again.
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