When preparing ammonium metatungstate by tungstic acid method, the control of pH value is crucial for the smooth progress of the reaction and the quality of the product. The following are the detailed steps and precautions for pH control:
Steps for pH control
Preliminary dissolution
First, tungstic acid is dissolved with ammonia and added to boiling deionized water. Heat the ammonia-by-ammonia under stirring to gradually increase the pH of the solution.
Acetic acid is added
With the solution boiling, acetic acid is added. The addition of acetic acid lowers the pH of the solution and helps stabilize the reaction environment.
Dilute Nitric Acid Adjustment
Next, dilute nitric acid is used to precisely adjust the pH of the solution to a range of 2 to 4. This step is to ensure that the reaction takes place under optimal acid-base conditions.
Precautions
Real-time monitoring
Throughout the process, the pH of the solution needs to be monitored in real time using an instrument such as a pH meter to ensure that it is within the desired range.
Precision
The amount of dilute nitric acid added needs to be precisely controlled, too much or too little may affect the reaction and the quality of the product.
Uniformity of stirring
Uniformity of stirring also has an important effect on pH control. Ensure that the solution is stirred uniformly at all times during the reaction.
Temperature control
In addition to pH, temperature is also an important factor affecting the reaction. It should be ensured that the reaction is carried out at the appropriate temperature to obtain the best product quality.
When preparing ammonium metatungstate by tungstic acid method, pH control is the key to ensure smooth reaction and product quality. Through real-time monitoring, precise operation, uniform stirring and proper temperature control, the pH value of the solution can be stabilized in the range of 2 to 4, so as to obtain high-quality ammonium metatungstate products.
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