1. With 0.1mol/L potassium hydroxide, it is called 5.6g potassium hydroxide. The potassium hydroxide solution cannot directly put the potassium hydroxide solid into the volumetric flask, because potassium hydroxide dissolves in water and will exotherm violently, so it should be Put a certain mass of potassium hydroxide weighed into a small beaker.
2. Then slowly inject distilled/deionized water that has been boiled to remove CO2 and cooled, and constantly stir with a glass rod to fully dissolve the potassium hydroxide solid.
3. After it cools down naturally, use a glass rod to drain the water into the volumetric flask, then wash the glass rod and beaker with distilled/deionized water that has been boiled to remove CO2 and cooled for 3~4 times, and pour the washing liquid into the volumetric flask. Then adjust the volumetric flask to volume.
Potassium hydroxide solution Remarks: Calibration is required if necessary after preparation. In addition, a 1000ml volumetric flask is used. Potassium hydroxide cannot be directly put into the volumetric flask and dissolved in water.