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Acids and Bases - Lewis Definition Of Acids And Bases. The BrÃ¸nsted-Lowry acid-base definition, while broader than the Arrhenius definition, is still limited to hydrogen-containing compounds, and is dependent on a hydrogen ion (that is, a proton) transferring from one molecule to another.
- OH-accepted proton, it is a base. - An acid is changed into a base and a base is changed into an acid. - These pairs of acids and bases are called conjugate acid-base pairs. - A conjugate acid-base pair differ from each other only by a proton. WEAK ACIDS AND BASES For weak acids and bases, the concentration of acid (base) is not the concentration of [H + ] ([OH - ]). Weak Acids Dissociated ions are in equilibrium with undissociated molecule.