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Antimony tetroxide is an inorganic compound with the formula Sb 2 O 4.This material, which exists as the mineral cervantite, [3] is white but reversibly yellows upon heating. The material, with empirical formula SbO 2, is called antimony tetroxide to signify the presence of two kinds of Sb centers.
The hydrated oxide is insoluble in nitric acid, but dissolves in a concentrated potassium hydroxide solution to give potassium hexahydroxoantimonate(V), or KSb(OH) 6. [6] When heated to 700 °C (1,290 °F), the yellow hydrated pentoxide converts to an anhydrous white solid with the formula Sb 6 O 13, containing both antimony(III) and antimony(V).
Antimony(III) acetate is the compound of antimony with the chemical formula of Sb(CH 3 CO 2) 3. It is a white powder, is moderately water-soluble, and is used as a catalyst in the production of polyesters .
Antimony(III) sulfate was first produced in 1827 by the reaction of antimony(III) oxide and 18 molar sulfuric acid at 200 °C: [1]. Sb 2 O 3 + 3 H 2 SO 4 → Sb 2 (SO 4) 3 + 3 H 2 O. The concentration of the sulfuric acid is important, as a lower concentration will produce basic antimony oxides, while a higher concentration will produce antimony(III) pyrosulfate.
Like many sulfides, this compound liberates hydrogen sulfide upon treatment with strong acids such as hydrochloric acid. [3]6 HCl + Sb 2 S 5 → 2 SbCl 3 + 3 H 2 S + 2 S. Analysis by Mössbauer spectroscopy indicates that this compound is a derivative antimony(III), [4] explaining the production of antimony(III) chloride, rather than antimony(V) chloride, upon acidification.
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