It is a colorless crystalline polytungstic acid, the chemical formula is H6[H2(W3O10)4]•nH2O (n is 10 or 23), the density is about 3.93g/cm3, and it is easily soluble in water (at room temperature, the solubility is about 88.57g/100cm3 water), poor thermal stability (easy to decompose at 50 ℃).
Production method: First, heat ammonium paratungstate and decompose it into ammonium metatungstate, then dissolve ammonium metatungstate in deionized water, age for several hours, then filter, and finally exchange the filtrate with cationic resin to obtain metatungstate acid solution.
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