Ammonium metatungstate and ammonium tungstate are obviously different in many aspects, and the following is a detailed explanation for the difference between them:
- Chemical formula and ionic composition
Ammonium metatungstate: the chemical formula is (NH₄)₁₀H₂W₁₂O₄₂-4H₂O, which contains metatungstate ions (W₁₂O₄²-).
Ammonium tungstate: chemical formula is (NH₄)₂W₂O₇, which contains tungstate ion (W₂O₇²-).
- Molecular structure
Ammonium metatungstate: the molecule is a tetrahedral structure in which the W₁₂O₄²- ion is the center surrounded by 10 NH₄⁺ ions.
Ammonium tungstate: the molecule has an octahedral structure with two W-O octahedra oxidized together by co-angle oxidation to form a molecular chain.
- Physical properties
Ammonium metatungstate: white crystal, easily soluble in water, slightly soluble in alcohols.
Ammonium tungstate: colorless rhombohedral crystals or white crystalline powder, easily soluble in water, but insoluble in ethanol.
- Uses
Ammonium metatungstate:
Used in the manufacture of metallic tungsten, alloy steel, fireproof fabrics and so on.
Used in ceramic industry.
As the main raw material of petrochemical catalyst.
Used to convert into ammonium tungstate in some processes.
Ammonium Tungstate:
Mainly used in the manufacture of tungsten trioxide or blue tungsten oxide to produce metallic tungsten powder.
These metallic tungsten powders can be used to manufacture tungsten materials (such as tungsten bars, tungsten wires and other electro-vacuum materials) and alloy series (such as tungsten carbide, cemented carbide, etc.).
Used as raw material for manufacturing ammonium metatungstate and other tungsten compounds.
Applied in petrochemical industry as additive.
- Safety
Both require attention to safe handling, but specific safety information (e.g., cautionary statements, precautions, etc.) may differ.
To summarize, ammonium metatungstate and ammonium tungstate have obvious differences in chemical formula, molecular structure, physical properties and uses. When using them, it is necessary to choose suitable compounds according to specific needs and pay attention to relevant safety operations.
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