What is pH standard buffer solution? What are its characteristics?
1. A pH buffer solution is a solution that keeps the pH value stable. If a small amount of acid or base is added to this solution, or a small amount of acid or base is produced by the chemical reaction in the solution, and the solution is properly diluted, the pH value of the solution is basically stable. Alkali is large or diluted, and the solution that keeps the pH value unchanged is called a buffer solution.
The pH standard buffer has the following characteristics:
(1) The pH value of the standard solution is known and reaches the specified accuracy;
(2) The pH value of the standard solution has good reproducibility and stability, and has a large buffer capacity, small dilution value and small temperature coefficient;
(3) The preparation method of the solution is simple;
2. How to prepare pH standard buffer solution?
For general pH measurement, a complete set of pH reagents (250mL can be prepared) can be used. When preparing the solution, deionized water should be used and boiled for 15-30 minutes in advance to remove dissolved carbon dioxide. Cut the plastic bag and pour the reagent into a beaker, dissolve it with an appropriate amount of deionized water, rinse the packaging bag, then pour it into a 250mL volumetric flask, dilute to the mark, and shake well.
