For general pH measurement, a set of pH buffer reagents (250ml can be prepared) can be used. When preparing the solution, deionized water should be used and pre-boiled for 15-30 minutes to remove dissolved carbon dioxide. Cut the plastic bag and pour the reagent into the beaker, dissolve it with an appropriate amount of deionized water, rinse the packaging bag, and pour it into a 250ml volumetric flask, dilute to the mark, and shake well.
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