Ionic molar conductivity limits is a size characteristic of a Ion, it is the contribution of the ion to the Conductivité of the solution. It depends on the load and the size on the ion.

Each ion behaves in a diluted solution as if it were alone. It is the law of migration independent of the ions.

σi=λ°i/z. Ci. zi

for a solution: σ = ∑σi