On the comparison of polarity between dichloromethane and ethyl acetate
The polarity of the couple is related to its molecular structure and charge distribution, and is of great significance to all things in chemistry, such as separation and dissolution. Today, the differences in polarity between dichloromethane (DCM) and ethyl acetate are discussed in detail.

In the molecular structure of dichloromethane, carbon atoms occupy the center, and two pairs of chlorine atoms and hydrogen atoms are arranged in a tetrahedron. Chlorine atoms have strong electronegativity, good ability to attract electrons, and cause uneven distribution of molecular charges, showing a certain polarity. However, its structure is relatively symmetrical. Although it has polarity, its degree is limited.

In contrast, ethyl acetate, its structure contains carbonyl and ethoxy groups. The oxygen atoms in the carbonyl group are highly electronegative, which makes the carbonyl carbon partially positively charged, and the ethoxy group also affects the electron cloud distribution. Overall, the polarity of ethyl acetate molecules is more significant due to the characteristics of functional groups.

Comparing the two, ethyl acetate has a stronger polarity than dichloromethane. This difference is evident in many chemical processes. For example, in the extraction operation, due to the difference in polarity, the solubility and extraction effect of the two are different for different polar substances. Dichloromethane has better solubility to non-polar or weakly polar substances due to its weak polarity; while ethyl acetate has relatively strong polarity and better solubility to slightly polar substances.

In column chromatographic separation, when the stationary phase is constant, dichloromethane and ethyl acetate are used as mobile phases, and the elution ability of each component in the sample is different due to different polarities. Those with small polarity have better elution effect of dichloromethane; those with slightly larger polarity are easier to move ethyl acetate.

In summary, clarifying the polarity difference between dichloromethane and ethyl acetate is an important basis for chemical experiment operation, material separation and purification, and can provide key guidelines for chemical research and practice.