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The strength of a carboxylic acid is influenced by the electron-withdrawing or electron-donating nature of groups attached to the alpha carbon. Electron-withdrawing groups stabilize the carboxylate anion, making the acid stronger. Conversely, electron-donating groups destabilize the carboxylate anion, making the acid weaker. For example, a halogen atom attached to the alpha carbon would increase the acidity due to its electron-withdrawing effect. In contrast, an alkyl group would decrease acidity because it is an electron-donating group.