Nomenclature
CAS number: 1314-62-1
Vanadium oxide (V
2O
5); vanadic anhydride.
O
5V
2; mol wt 181.88.
O 43.98%, V 56.02%.
V
2O
5.
Description and references
Prepd by heating ammonium metavanadate, NH4VO3.
Properties
Yellow to rust-brown orthorhombic crystals; d 3.35; mp 690°. Poisonous. Loses oxygen reversibly in the region 700-1125°.
One gram dissolves in ≈125 ml water; sol in concd acids, forming
red to yellow solns; sol in alkalies, forming vanadates; insol in
alcohol. Its acid solutions are reduced by SO2, Zn + HCl,
and by evaporation with HCl.Caution
Reported to be a respiratory irritant
and to cause skin pallor, greenish-black tongue, chest pain, cough,
dyspnea, palpitation, lung changes. When ingested, causes G.I. disturbances.
May also cause a papular skin rash: Zenz et al., Arch. Environ. Health 5, 542 (1962);
E. Browning, Toxicity of Industrial Metals (Appleton-Century-Crofts, New York, 2nd ed., 1969) pp 340-347.Use
As catalyst in the oxidation of SO
2 to
SO
3, alcohol to acetaldehyde, etc.; for the manuf of yellow
glass; inhibiting ultraviolet light transmission in glass; depolarizer;
as developer in photography; in form of ammonium vanadate as mordant
in dyeing and printing fabrics and in manuf of aniline black.