How to synthesise ammonium tungstate from ammonium metatungstate?

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Kelly Sellers

Ammonium Tungstate comes in two main forms – paratungstate and metatungstate. Ammonium paratungstate is a white crystalline salt of ammonium and tungsten, partly soluble in water, and is usually found in one of two states within its chemical compound – either pentahydrate (with five molecules of water) and decahydrate (with ten molecules of water).

When ammonium paratungstate is heated to between 220 and 280 degrees Celsius, it loses part of its ammonium and water compounds, transforming into ammonium metatungstate. This new compound is a highly pure, water-soluble tungsten powder.