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Acetic anhydride and glacial acetic acid are common chemical substances in our daily lives, and they have some differences in chemical properties. 

Acetic anhydride is an ester compound with the molecular formula (CH3CO) 2O. It is commonly used as a raw material for organic synthesis and can also be used for esterification and ester reactions in organic synthesis reactions. 

Acetic acid, on the other hand, is an organic acid with the chemical name acetic acid and the molecular formula CH3COOH. It is commonly used as a solvent and reagent, and can also be used in food additives and certain chemical experiments. 

Acetic anhydride and acetic acid have certain similarities in structure, but there are significant differences in properties and uses. Acetic anhydride is a colorless liquid with a pungent odor, which is volatile and has a stimulating effect on the skin and eyes. 

Acetic acid, on the other hand, is a colorless liquid with a pungent odor, which is more volatile and also has a stimulating effect on the skin and eyes. 

Acetic anhydride and glacial acetic acid also have significant differences in their uses. Acetic anhydride is mainly used in organic synthesis reactions, while glacial acetic acid is commonly used in chemical experiments and certain industrial production. 

In summary, although acetic anhydride and glacial acetic acid have certain similarities in structure, they have significant differences in properties and applications. When using them, we need to choose appropriate chemical substances based on specific needs.