  We present a method to embed local electroneutrality within
Onsager-Stefan-Maxwell electrolytic-transport models, circumventing their
formulation as differential systems with an algebraic constraint. Flux-explicit
transport laws are formulated for general multicomponent electrolytes, in which
the conductivity, component diffusivities, and transference numbers relate to
Stefan-Maxwell coefficients through invertible matrix calculations. A
construction we call a `salt-charge basis' implements Guggenheim's
transformation of species electrochemical potentials into combinations
describing a minimal set of neutral components, leaving a unique combination
associated with electricity. Defining conjugate component concentrations and
fluxes that preserve the structures of the Gibbs function and energy
dissipation retains symmetric Onsager reciprocal relations. The framework
reproduces Newman's constitutive laws for binary electrolytes and the
Pollard-Newman laws for molten salts; we also propose laws for salt solutions
in two-solvent blends, such as lithium-ion-battery electrolytes. Finally, we
simulate a potentiostatic Hull cell containing a non-ideal binary electrolyte
with concentration-dependent properties.
