The pH range of Ammonium Metatungstate may vary depending on the specific conditions and concentration of the aqueous solution. In general, the pH of ammonium metatungstate usually ranges from 2.5 to 9. Among them, the most common crystalline types, α- and β-type, have pH values of 6.8 and 6.2, respectively.
In some preparations, such as the neutralization method, the pH of ammonium metatungstate is controlled between 2 and 4. In the tungstic acid method of preparation, the pH is adjusted to 2 to 4 with dilute nitric acid after the addition of acetic acid.
National standards for the pH value of ammonium metatungstate:
According to the discussion draft of the national standard for ammonium metatungstate, the pH value determined by a solution with tungsten trioxide content of 650g/L at room temperature is not greater than 4.5.
Concentration of aqueous solution: the pH value of aqueous solution of ammonium metatungstate is between 2 and 4 at 25℃.
In summary, the following conclusions can be drawn:
The pH range of ammonium metatungstate varies depending on the preparation method and conditions, but is usually between 2 and 9.
The pH values of the most common crystalline types, α-type and β-type, are 6.8 and 6.2, respectively.
In some preparation processes and national standards, pH values are controlled or required to be between 2 and 4.
These values are generalized based on different conditions and experimental results, and need to be adjusted and confirmed according to the actual use.
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