The chemical formula of ammonium metatungstate hydrate can be clearly expressed as (NH₄)₆H₂W₁₂O₄₀-xH₂O, where:
(NH₄)₆: represents six ammonium ions (NH₄⁺).
H₂: represents two hydrogen atoms.
W₁₂: represents twelve tungsten atoms.
O₄₀: indicates forty oxygen atoms.
-xH₂O: This part represents water molecules bound to ammonium metatungstate, where x is a variable number representing the number of water molecules. Since the value of x may vary, the specific molecular formula of ammonium metatungstate hydrate may also vary.
In addition, Ammonium metatungstate hydrate has a CAS number of 12333-11-8 and an EINECS number of 234-733-4. Its molecular weight is approximately 2956.30 (but the exact value may vary depending on x).
Ammonium metatungstate hydrate is a white crystalline powder or slightly yellow chemical substance, soluble in water, used in the manufacture of tungsten metal, alloy steel, fireproof fabrics, etc., and is the main raw material for tungsten-based catalysts in oil refineries. When used and stored, attention should be paid to its possible environmental and health risks.
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