Nitrosylsulfuric Acid
Title: Nitrosylsulfuric Acid
CAS Registry Number: 7782-78-7
CAS Name: Sulfuric acid monoanhydride with nitrous acid
Additional Names: nitrosyl sulfate; chamber crystals; nitrososulfuric acid; nitroxylsulfuric acid; nitrosulfonic acid; nitrosyl hydrogen sulfate; nitro acid sulfite
Trademarks: Nitrose (Fort Dodge)
Molecular Formula: HNO5S
Molecular Weight: 127.08
Percent Composition: H 0.79%, N 11.02%, O 62.95%, S 25.23%
Literature References: Formed as an intermediate in the lead chamber process for sulfuric acid by the reaction of sulfur dioxide, nitrogen trioxide, oxygen, and water: Clément, Désormes, Ann. Chim. Phys. [1] 59, 329 (1806); Lunge, J. Chem. Soc. 47, 470 (1885). Prepd from sulfur trioxide, nitrogen oxides and water: Döbereiner, Schweigger's Journ. 8, 239 (1812); de Claubry, Ann. Chim. Phys. [2] 45, 284 (1832); Kuhlmann, ibid. [3] 1, 116 (1843); from silver acid sulfate and nitrosyl bromide: Berl et al., Z. Anorg. Allg. Chem. 209, 264 (1932). See also US 1909557 and US 1909558. The formation of crystals of nitrosylsulfuric acid may be observed by igniting a mixture of 1 part sulfur and 2 or 3 parts potassium nitrate under a bell jar.
Properties: Prisms, dec 73.5°. In moist air the crystals dec with the formation of sulfuric and nitric acids and above 50° nitric oxide and nitrogen dioxide are evolved. Sol in sulfuric acid, dec in water.
Use: For bleaching cereal milling products.

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