Similarly, SnO 2 dissolves in sulfuric acid to give the sulfate: SnO 2 + 2 H 2SO 4 → Sn(SO 4) 2 + 2 H 2O One report describes reacting a sample in refluxing HI for many hours. Halogen acids attack SnO 2 to give hexahalostannates, such as 2−. "Stannic acid" refers to hydrated tin (IV) oxide, SnO 2, which is also called "stannic oxide." Amphoterism Īlthough SnO 2 is insoluble in water, it is amphoteric, dissolving in base and acid. SnO 2 is reduced industrially to the metal with carbon in a reverberatory furnace at 1200–1300 ☌. Annual production is in the range of 10 kilotons. Synthetic tin(IV) oxide is produced by burning tin metal in air. Such materials appear to be hydrated particles of SnO 2 where the composition reflects the particle size. Hydrous forms of SnO 2 have been described as stannic acid. SnO 2 is usually regarded as an oxygen-deficient n-type semiconductor. As such the tin atoms are six coordinate and the oxygen atoms three coordinate. Tin(IV) oxide crystallises with the rutile structure. Tin (IV) oxide fibers ( optical microscope)
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