Carboxylate

A carboxylate is the conjugate base of a carboxylic acid, R−COO− (or R−CO−2). It is an ion with negative charge. Carboxylate ions are made when a carboxylic acid loses a hydrogen ion. Such acids usually have pKa of less than 5, meaning that many bases, such as sodium hydroxide or sodium bicarbonate can remove the hydrogen ions from them.

RCOOH + NaOH → RCOONa + H2O

Examples

Some examples of carboxylates include;

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