Chemistry – Organic chemistry - Carboxylic acids | e-Consult
Organic chemistry - Carboxylic acids (1 questions)
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The reaction of a carboxylic acid with an alcohol to form an ester is a condensation reaction. It requires an acid catalyst, typically sulfuric acid (H2SO4) or hydrochloric acid (HCl). The reaction proceeds as follows:
- Reactants: A carboxylic acid (R-COOH) and an alcohol (R'-OH).
- Products: An ester (R-COOR') and water (H2O).
- Role of the Catalyst: The acid catalyst protonates the carbonyl oxygen of the carboxylic acid, making it more susceptible to nucleophilic attack by the alcohol. It also facilitates the removal of water.
- Conditions: The reaction is typically carried out with heating (reflux) to increase the rate. A large excess of the alcohol is often used to drive the reaction to completion (Le Chatelier's principle). The water produced is removed to prevent the reverse reaction (hydrolysis) from occurring. This can be achieved using a Dean-Stark apparatus.
The balanced chemical equation is:
R-COOH + R'-OH ⇌ R-COOR' + H2O