The molecular formula of metatungstic acid is H2W4O13•9H2O, the molecular weight is 1107.55, and it is a colorless tetragonal crystal. The relative density is 3.93, and it will decompose when heated to 50°C. Soluble in water, ether or alkaline solution. It is prepared by the action of sulfuric acid and barium metatungstate. Metatungstic acid weathers in the air; structurally, metatungstic acid is similar to heteropolyacids such as tungstophosphoric acid, but its central element is two hydrogen atoms. Because it is polymerized from the same tungstic acid, it can also be regarded as isopoly acid.
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