This episode discusses Conjugate Acid-Base Pairs as a necessary outcome of the Brønsted-Lowry definition. When an acid donates a proton (H+), it forms its conjugate base; when a base accepts a proton, it forms its conjugate acid. These pairs always differ by exactly one proton. Crucially, the strength of an acid is inversely related to the strength of its conjugate base. In any acid-base reaction, equilibrium favors the side containing the weaker acid and weaker base.