Polarity comparison: The polarity of dichloromethane and ethyl acetate
is related to its molecular structure and charge distribution, which is crucial for chemical experiments, separation and purification. The difference in polarity between dichloromethane (DCM) and ethyl acetate.

dichloromethane, its molecular formula is\ (CH_ {2} Cl_ {2}\). Carbon is in the center and is connected to dihydrodichloride. The electronegativity of chlorine is stronger than that of carbon, and the electron cloud is biased towards chlorine atoms, resulting in uneven molecular charge distribution and polarity. However, its structure is close to tetrahedron, and the relative positions of dichlorine atoms cause some polarities to cancel each other, and the polarity is not strong.

Ethyl acetate, the structural formula is\ (CH_ {3} COOCH_ {2} CH_ {3}\). Containing carbonyl (\ (C = O\)) and ester (\ (-COO -\) ） 。 carbonyl, the oxygen electronegativity is strong, and the electron cloud between carbon and oxygen is biased towards oxygen, so that the carbonyl carbon is partially positively charged and the oxygen is partially negatively charged; the ester group is also due to the electronegativity of oxygen, resulting in a significant uneven charge distribution. And its structure is asymmetric, there is no mutual cancellation effect, and its polarity is stronger than that of dichloromethane.

In summary, among dichloromethane and ethyl acetate, ethyl acetate is more polar. During the experiment, according to the difference in material polarity, the solvent is selected to assist in the separation and extraction operations, achieving the expected effect.