There are significant differences between ammonium metatungstate and metatungstic acid in many aspects. Here is a clear comparison between the two:
- Ammonium metatungstate and metatungstic acid have different definitions and chemical formulas
Ammonium metatungstate (AMT):
Definition: An inorganic compound commonly used as a precursor for the production of tungsten metal, tungsten alloys and other tungsten products.
Chemical formula: H28N6O41W12, molecular weight is approximately 2974.32.
Metatungstic acid:
Definition: A colorless crystalline polytungstic acid.
Chemical formula: H6[H2(W3O10)4]·nH2O (n is 10 or 23), density is about 3.93g/cm³.
- Ammonium metatungstate and metatungstic acid have different physical properties
Ammonium metatungstate:
Appearance: Usually white crystalline powder or slightly yellow.
Solubility: Easily soluble in water, but insoluble in alcohol.
Metatungstic acid:
Appearance: colorless crystal.
Solubility: Easily soluble in water, but easily degraded and has poor thermal stability.
- Ammonium metatungstate and metatungstic acid have different uses
Ammonium metatungstate:
Widely used in the production of metal tungsten, alloy steel, fire-proof fabrics, etc.
Used in ceramic industry and manufacturing various petrochemical catalysts.
It is used as a cathode material in lithium-ion batteries and has good electrochemical properties.
Metatungstic acid:
Mainly used to prepare metatungstate or other tungsten compounds.
Due to its easy degradation and poor thermal stability, direct applications are relatively rare.
- The production processes of ammonium metatungstate and metatungstic acid are different.
Ammonium metatungstate:
There are various production methods, including solvent extraction, ion exchange method, heating ammonium paratungstate, etc.
It can be produced through a variety of raw materials and processes.
Metatungstic acid:
Common preparation methods include acidifying the tungstate solution to a specific pH value, then aging, drying and other steps.
Due to its easy degradation and poor stability, special attention should be paid to controlling conditions during the preparation process.
In summary, there are significant differences between ammonium metatungstate and metatungstic acid in terms of definition, chemical formula, physical properties, uses and production processes. As an important industrial raw material, ammonium metatungstate is widely used in many fields; while metatungstic acid is mainly used to prepare other tungsten compounds, and its direct applications are relatively few.
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