Saponification of Ethyl Acetate and Sodium Hydroxide
Now there is a phase reaction between ethyl acetate and sodium hydroxide, which undergoes a saponification reaction. The two are in contact, and their molecules interact. Sodium acetate and ethanol.

In this reaction, ethyl acetate ($C_ {4} H_ {8} O_ {2} $) reacts with sodium hydroxide ($NaOH $) in equal molar number. The chemical equation is as follows: $C_ {4} H_ {8} O_ {2} + NaOH\ longrightarrow C_ {2} H_ {3} O_ {2} Na + C_ {2} H_ {5} OH $.

At the beginning, put the solution of ethyl acetate and sodium hydroxide in one place, and the concentration can be known. As the reaction progresses, the amount of sodium hydroxide gradually decreases, due to the combination with ethyl acetate. The titration method can be used to measure the change in the concentration of sodium hydroxide to show the progress of the reaction.

When the reaction is completed, ethyl acetate and sodium hydroxide are almost exhausted, and a mixture of sodium acetate and ethanol is produced. This saponification reaction is common in the chemical industry and laboratories, which can be used to understand the principle of the reaction and can also be used as the basis for the preparation of other substances.