What proportion of acetic acid is ionized?

The proportion of acetic acid that is ionized depends on its concentration and the conditions of the solution. In dilute solutions, typically only about 1-2% of acetic acid (a weak acid) ionizes into acetate ions and hydrogen ions. The degree of ionization can be calculated using the acid dissociation constant (Ka) and the initial concentration of acetic acid. For a more precise value, specific conditions and concentrations would need to be considered.