On the solubility of urea in ethyl acetate
Whether urea is soluble in ethyl acetate or not, it is necessary to investigate the physical properties and interaction between the two. Urea is an organic compound, and its molecules contain amino and carbonyl groups, which have a certain polarity. Although ethyl acetate is an ester, it also has a certain polarity, but it is weaker than urea.

In terms of the solubility of substances, it often follows the principle of "similar miscibility". Substances with similar polarities are easily miscible. Urea is polar. To dissolve into ethyl acetate, it must overcome its own intermolecular forces and form new forces with ethyl acetate molecules.

From the perspective of intermolecular forces, urea molecules can form hydrogen bonds and interact strongly. Although ethyl acetate has a certain polarity, its intermolecular force is mainly van der Waals force, which is relatively weak. When urea is placed in ethyl acetate, the hydrogen bond between the molecules of urea is difficult to be effectively destroyed by the ethyl acetate molecule, and it is difficult for the two to form a strong interaction sufficient to promote the dissolution of urea.

Furthermore, the experimental facts can also be proved. Many experiments have shown that the solubility of urea in ethyl acetate is very small. Due to the difference in molecular structure and properties between the two, it is difficult for urea to disperse uniformly in ethyl acetate, that is, it is difficult to dissolve in ethyl acetate.

In summary, the poor solubility of urea in ethyl acetate is caused by the combination of factors such as molecular polarity and intermolecular forces.