C6H5CO2

C6H5CO2 represents the chemical formula for the benzoate ion. This is a polyatomic anion, meaning it is a molecule composed of multiple atoms with an overall net charge. Specifically, it consists of a benzene ring (C6H5) attached to a carboxylate group (CO2). The benzene ring is a planar, hexagonal structure of six carbon atoms, each bonded to one hydrogen atom, with delocalized pi electrons contributing to its stability. The carboxylate group has a carbon atom double-bonded to one oxygen atom and single-bonded to another oxygen atom, with the latter carrying a negative charge.

The benzoate ion is the conjugate base of benzoic acid, with the chemical formula C6H5COOH. When benzoic acid loses a proton (H+), it forms the benzoate ion. This ion is commonly found in salts, such as sodium benzoate (C6H5CO2Na) and potassium benzoate (C6H5CO2K), which are often used as preservatives in food and beverages due to their antimicrobial properties, particularly against yeasts and molds. The benzoate ion can also participate in various organic reactions, acting as a nucleophile or a leaving group depending on the reaction conditions. Its structure allows for resonance, where the negative charge is delocalized between the two oxygen atoms of the carboxylate group, contributing to its stability.