The pH determination of ammonium metatungstate can be done according to the following steps. Combined with the relevant information in the referenced articles, I have compiled a detailed list of steps and precautions for you:
Preparation
Make sure that all instruments and reagents used are clean and meet the experimental requirements.
Prepare a calibrated pH meter and the corresponding glass electrode or microelectrode.
Prepare a standard buffer solution for calibrating the pH meter.
Calibrate the pH meter
Calibrate the pH meter using standard buffer solutions (e.g., buffer solutions for pH = 4, 7, and 10).
Insert the electrodes into the standard buffer solutions of different pH values in turn, wait for the electrode potential to stabilize, and note down the correspondence between the potential value and the pH value of the standard buffer solution.
Determination of pH value of ammonium metatungstate solution
Rinse the electrode with deionized water and dry it gently with a paper towel.
Insert the electrode into the ammonium metatungstate solution to be measured, making sure that the electrode is completely immersed in the solution, but not touching the wall or bottom of the container. Wait for the electrode potential to stabilize and read the pH value displayed by the pH meter.
Caution:
Throughout the experiment, try to avoid contact between the electrode and any substance that may contaminate its surface.
Make sure that the solution to be tested is homogeneous and that there are no air bubbles attached to the electrode.
If the solution to be measured is dark in color or contains suspended matter, special electrodes or pretreatment may be required.
Clean and calibrate the pH meter regularly to ensure accuracy and reliability.
Record and report results:
Record the ambient temperature at the time of measurement, electrode type, calibration data, and the actual pH value measured.
If necessary, information such as the method of preparation and concentration of the solution can also be recorded.
Present the results in the form of a report, including all necessary experimental details and data analysis.
By following these steps, you can accurately determine the pH of an ammonium metatungstate solution. Please note that in practice, you may need to make appropriate adjustments according to specific experimental conditions and equipment requirements.
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