<p>The properties of dilute, compensated “weak” electrolytes on the example of the binary mixture “acid + alkali + water” have been discussed within the framework of phenomenological energy statistics. The concepts of weak donors and acceptors have been consistently defined at the energy level. A natural criterion of donor–acceptor agreement has been formulated by analyzing tabular data on the dissociation constants <i>K</i>_d(<i>T</i>) and <i>K</i>_a(<i>T</i>) in Ostwald’s dilution law for weak acids and alkalis (these constants are defined below). The fundamental role of the existence and possibilities of observing the compensation effect in binary electrolytes in determining the main energy parameters of phenomenological statistics of dilute weak hosts is emphasized.</p>