The electrodiffusion problem is solved for the case where metal cations are reduced in parallel with anions, hydrogen ions are involved in reduction of the anions, and ionic charge is arbitrary. The resulting behavior of the limiting diffusion and migration current includes both a depression of migration, caused by the addition of acid to the solution, and an enhancement of migration caused by correlational exaltation of the migration current. The "totally" limiting currents are calculated as functions of the stoichiometric coefficients, the solution composition, and the diffusion coefficients of the ionic components.