Silicon tungstic acid (Silicotungstic Acid) is a heteropoly acid containing silicon and tungsten, its chemical formula is H4[W12SiO40], it is light yellow solid, white or light yellow deliquescent crystal, easily soluble in water and alcohol. Solubility in water: 0.1 g/mL, clear and transparent after dissolved. It dissolves in its own crystal water when heated, and decomposes when heated to 600-650°C.
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