The physical properties of ammonium metatungstate hydrate can be summarized as follows:
- Appearance and color:
o Ammonium metatungstate hydrate usually appears as a white or slightly yellow crystalline powder.
- Solubility:
o Ammonium metatungstate hydrate is readily soluble in water and in ethanol, but insoluble in benzene. o The solubility of the ammonium metatungstate hydrate is generally in the range of 0.5 to 0.5 mm.
o Its solubility generally ranges from 0.2% to 0.4%, showing relatively low solubility.
- crystallinity:
o As a hydrate, ammonium metatungstate hydrate is capable of forming crystals under the right conditions, which is an important feature of its physical properties.
- Other physical constants:
o Specific data on the physical constants of ammonium metatungstate hydrate such as density, melting point, boiling point, refractive index, etc., are not available at this time due to limited information. However, since it is a crystalline powder, usually the melting point of such substances is high, while the boiling point is dependent on its degree of dehydration.
- pH:
o Aqueous solutions of ammonium metatungstate hydrate are weakly acidic, with pH values typically ranging from 3.0 to 4.5. o Ammonium metatungstate hydrate has a low pH.
- Stability:
o At room temperature and pressure, ammonium metatungstate hydrate is relatively stable, but at high temperature it is easy to lose water of crystallization and even ammonia generates tungsten oxide, showing its certain characteristics in thermal stability.
To summarize, as a white or slightly yellow crystalline powder, ammonium metatungstate hydrate has good solubility and crystallinity, the aqueous solution is weakly acidic, and may show thermal instability at high temperatures.
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