Theory of Strong Electrolytes

The theory of strong electrolytes describes strong electrolytes as substances that ionize completely in solution at all concentrations up to their saturation point. The interionic forces still act, depending on the solvent's dielectric constant and solution concentration.

For instance, in high-dielectric solvents like water, electrostatic forces between ions are relatively weak.

Despite complete ionization, molar conductance decreases with increasing concentration due to stronger interionic attractions that hinder ionic mobilities.

This theory also says that each ion is surrounded by an 'ionic atmosphere' of oppositely charged ions.

The application of an electric field moves the ions, disrupting the atmosphere's symmetry and slowing down the central ion’s movement—a phenomenon called the asymmetry effect.

Simultaneously, the electrophoretic effect, where the ionic atmosphere and the related solvent molecules move in the opposite direction of the central ion, creates a counter-current that further slows ion movement.

The viscous effect adds frictional drag from the solvent, further reducing ionic mobility and conductance.