Equivalent Conductance

Equivalent conductance, symbol $\Lambda$ (without the m subscript), is the older, gram-equivalent-based counterpart of molar conductivity, and it remains the natural unit to use whenever a solution's concentration is expressed in normality (N) rather than molarity — as is common in conductometric titrations. It is defined as the conductance of the volume of solution, again call it V m³, that contains exactly one gram-equivalent of the electrolyte, measured between electrodes 1 m apart.

Following exactly the same logic used to derive molar conductance from specific conductance, but replacing molarity with normality, gives the working relationship

where κ is the specific conductance and N is the concentration of the electrolytic solution expressed in normality. Because a gram-equivalent is generally a fraction of a mole (mole divided by the n-factor, e.g. valence for a simple ion), equivalent conductance and molar conductance differ by exactly that same factor for any given electrolyte. …