Limiting Molar Conductivity
The molar conductivity of an electrolyte extrapolated to infinite dilution, where ionic interactions vanish.
Formula / equation
Λ°m
Unit
S·cm²/mol
In depth
For strong electrolytes it is found by extrapolating a plot of molar conductivity against the square root of concentration to zero. Comparing the actual value at a given concentration with the limiting value gives the degree of dissociation of a weak electrolyte directly.
Examples in the real world
HCl has Λ° = 426 S·cm²/mol, unusually high because protons hop through the hydrogen-bonded network.