Ammonium metavanadate is an inorganic compound represented by the formula NH4VO3. As a crystalline solid, it is white, but samples can sometimes appear slightly yellow. It has a molecular weight of 116.977 g/mol.
It is denser than water and slightly soluble. Ammonium metavanadate is somewhat toxic, particularly to the skin, and should always be handled with care. It is stable under normal storage conditions.
The chemical is primarily used as an intermediate or as an oxidizing agent. It is commonly used as a substrate in the synthesis of silver vanadate, manganese vanadate, and vanadium oxide. It can catalyze the synthesis of octahydroquinazolinone derivatives and azalactone derivatives.