Some tungstates exist in the form of hydrates, and the solution is strongly alkaline; some are insoluble. Except for alkali metal, ammonium and magnesium salts, most of tungstates are insoluble in water. The crystals of tungstate contain discrete WO tetrahedral ions, which slowly hydrolyze and polymerize in aqueous solution, and quickly polymerize into isopolyacid salt in slightly acidic solution.
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