No, acetic acid is a weak acid. Acids are categorized into strong or weak acid based on their ionization in water. A strong acid? is completely ionized in an aqueous solution, whereas weak acid ionizes slightly in aqueous solution. Acetic acid has a methyl group linked to the Carboxylic acid, which has a positive inductive action and raises the electron density on the carbon of the carboxylic group, resulting in lowering its acidity. Thus acetic acid is a weak acid.