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Vanadium(IV) oxide or vanadium dioxide is an inorganic compound with the formula VO 2. It is a dark blue solid. It is a dark blue solid. Vanadium (IV) dioxide is amphoteric , dissolving in non-oxidising acids to give the blue vanadyl ion , [VO] 2+ and in alkali to give the brown [V 4 O 9 ] 2− ion, or at high pH [VO 4 ] 4− . [ 4 ]
Vanadium oxide mainly refers to: Vanadium(II) oxide (vanadium monoxide), VO; Vanadium(III) oxide (vanadium sesquioxide or trioxide), V 2 O 3; Vanadium(IV) oxide (vanadium dioxide), VO 2; Vanadium(V) oxide (vanadium pentoxide), V 2 O 5; Various other distinct phases include: Phases with the general formula V n O 2n+1 exist between V 2 O 5 and VO 2.
The US National Institute for Occupational Safety and Health (NIOSH) has recommended that 35 mg/m 3 of vanadium be considered immediately dangerous to life and health, that is, likely to cause permanent health problems or death. [119] Vanadium compounds are poorly absorbed through the gastrointestinal system.
Vanadium pentoxide is a commercially important catalyst for the production of sulfuric acid, a reaction that exploits the ability of vanadium oxides to undergo redox reactions. [2] The vanadium redox battery utilizes all four oxidation states: one electrode uses the +5/+4 couple and the other uses the +3/+2 couple. Conversion of these oxidation ...
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Vanadyl sulfate is most commonly obtained by reduction of vanadium pentoxide with sulfur dioxide: . V 2 O 5 + 7 H 2 O + SO 2 + H 2 SO 4 → 2 [V(O)(H 2 O) 4]SO 4. From aqueous solution, the salt crystallizes as the pentahydrate, the fifth water is not bound to the metal in the solid.
Metal toxicity or metal poisoning is the toxic effect of certain metals in certain forms and doses on life.Some metals are toxic when they form poisonous soluble compounds. . Certain metals have no biological role, i.e. are not essential minerals, or are toxic when in a certain for
A vanadium ore or vanadium-rich residue is treated with sodium carbonate and an ammonium salt to produce sodium metavanadate, NaVO 3. This material is then acidified to pH 2–3 using H 2 SO 4 to yield a precipitate of "red cake" (see above). The red cake is then melted at 690 °C to produce the crude V 2 O 5.