Variation of molar conductivity with concentration

The molar conductivity behaves differently from conductivity on dilution:

i. The molar conductivity is the electrical conductance of 1 mole of an electrolyte in a given volume of solution.

ii. The increasing number of ions produced in solution by 1 mole of the electrolyte on dilution leads to increased molar conductivity.

The contrast with section 5.3.4 is worth pausing on: conductivity ($\kappa$) counts the ions in a FIXED unit volume, so dilution — which spreads a growing but not proportionally growing number of ions through a larger volume — makes $\kappa$ fall. Molar conductivity ($\Lambda$) instead follows ALL the ions that one mole of the electrolyte supplies, whatever volume they occupy; since dilution pushes the dissociation further toward completion, that total ion count rises, and $\Lambda$ rises with it. How …