Potassium hydroxide and acetic acid
There was a scholar in a certain government who was good at understanding things. One day, the scholar wanted to study the change between potassium hydroxide and acetic acid.

The scholar took potassium hydroxide, which is pure in color, strong in nature, alkaline in nature, soluble in water and warm. Acetic acid is also taken, which has a sour taste and acidity. It often exists in vinegar and can also dissolve water.

The scholar dissolved potassium hydroxide into a clear liquid, placed it in a container, and gradually dripped acetic acid into it. At first, the liquid was silent, but the two had quietly merged. In potassium hydroxide, hydroxide and hydrogen ions in acetic acid meet and dissolve water, and acetate and potassium ions exist in the liquid.

After a little while, the reaction in the liquid is completed, and the liquid of potassium acetate is obtained. Potassium acetate is stable and soluble in water. It can be used for other purposes, such as adjusting soil acid and alkali, and helping plants grow.

After this study, the theory of the phase of potassium hydroxide and acetic acid is known, and the combination of the two is known to produce new things. In the study of matter, it is further advanced.