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Esters are organic compounds formed by the reaction of a carboxylic acid and an alcohol. Here's an example:
Reaction:
Acetic acid (CH3COOH) + Ethanol (CH3CH2OH) -→ Ethyl acetate (CH3COOCH2CH3) + Water (H2O)
Explanation:
The hydroxyl group (OH) from the carboxylic acid and a hydrogen atom from the alcohol combine to form water.
The remaining parts of the molecules join to form the ester.
Ethyl acetate is a common example of an ester, often used as a solvent and in flavorings.