Carboxylate

A carboxylate is an ion or salt containing the deprotonated carboxyl group, –COO−. Its negative charge is delocalized across two oxygen atoms.

Carboxylic acid: An organic compound containing a carboxyl group, –COOH, which can lose a proton to form a carboxylate. Deprotonation of this acid produces the carboxylate ion.
Carboxyl group: The functional group –COOH, consisting of a carbonyl group bonded to a hydroxyl group. Loss of its hydroxyl proton converts the carboxyl group into –COO−.
Acetate: The carboxylate anion derived from acetic acid, with formula CH₃COO−. Acetate is a simple, common example of a carboxylate ion.
Carboxylate ester: An ester is a neutral derivative of a carboxylic acid in which its hydroxyl group is replaced by an –OR group. An ester can resemble a carboxylate structurally but lacks its anionic charge.
Resonance (chemistry): A representation of molecular structure using multiple contributing Lewis structures rather than one fixed arrangement of electrons. Equivalent resonance contributors distribute carboxylate’s negative charge over both oxygen atoms.
Carbonyl group: A functional group containing a carbon atom double-bonded to an oxygen atom. The carbonyl carbon remains part of the carboxylate’s central structure.
Amino acid: An organic molecule containing both an amino group and a carboxyl group. At common biological pH, amino acids often carry a deprotonated carboxylate group.
Carboxamide: A carboxamide is a carboxylic acid derivative in which the hydroxyl group is replaced by an amino group. Replacing oxygen with nitrogen gives a distinct derivative rather than a carboxylate.
Acid dissociation constant: A quantitative measure of an acid’s tendency to transfer a proton to a base in solution. The pKa helps predict how much of a carboxylic acid exists as carboxylate at a given pH.
Ionic bond: An electrostatic attraction between oppositely charged ions. A carboxylate salt pairs the anion with positively charged counterions.

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