Solubility: | Practically insoluble in alkali hydroxides or fused alkalis; reacts with nitric acid, hot concentrated sulfuric acid, fused potassium chlorate or nitrate Insoluble in water; soluble in nitric acid, sulfuric acid; slightly soluble in hydrochloric acid; insoluble in hydrofluoric acid, dilute sulfuric acid Insoluble in hydrochloric acid and hydrogen fluoride, ammonia, sodium hydroxide, or dilute sulfuric acid; soluble in hot concentrated sulfuric or nitric acids |