Potassium hexahydroxoantimonate

The hydrated oxide is prepared by hydrolysis of antimony pentachloride or by acidification of potassium hexahydroxoantimonate(V), KSb(OH)6 [12208-13-8]. The product, filtered and air dried at ambient temperature has approximate composition 86205 3.5H2O. It may be also prepared by oxidation of antimony trioxide with nitric acid. 

For the study of these reactions, an acidified 0-2m solution of potassium hexahydroxoantimonate K[Sb(OH)6] can be used. Alternately, antimony pentoxide Sb2Os may be dissolved in concentrated hydrochloric acid. 

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