698. Antimony Pentoxide

Nomenclature

CAS number: 1314-60-9
Antimony oxide (Sb2O5); antimonic oxide; diantimony pentoxide; stibic anhydride.
O5Sb2; mol wt 323.52.
O 24.73%, Sb 75.27%.
Sb2O5.

Description and references

Prepn: Schenk in Handbook of Preparative Inorganic Chemistry vol. 1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) p 616. Toxicity study: W. R. Bradley, W. G. Fredrick, Ind. Med. 10; Ind. Hyg. Sect. 2, 15 (1941).

Properties

Yellowish powder. Cubic. d 3.78. Loses oxygen at 300° or higher. Studies have shown that the compound does not correspond fully to Sb2O5, but that it is always somewhat hydrated. Slightly soluble in water. Practically insol in HNO3. Slowly dissolves in warm HCl or in warm KOH soln. LD50 i.p. in rats: 400.0 mg Sb/100 g (Bradley, Fredrick).

Use

Flame retardant.