When will the conductivity become equal to the molar conductivity?

Conductivity becomes equal to molar conductivity when 1 cm3 of the solution placed between two large electrodes of 1 cm2 area of cross-section lying 1 cm apart contains 1 mole of electrolyte.

Molar conductivity

Molar conductivity is the conductance property of a solution containing one mole of the electrolyte. It is a function of the ionic strength of a solution or the concentration of salt. In general, the molar conductivity of an electrolytic solution is the conductance of the volume of the solution containing a unit mole of electrolyte that is placed between two electrodes of unit area cross-section or at a distance of one centimetre apart.

The following expression is used to represent molar conductivity mathematically.

  • Λm = K / C
  • K is the specific conductivity, and c is the concentration in mole per litre.

Conductivity

The conductivity of a solution is equal to the conductance of a 1 cm length and cross-section area of 1 square cm. it may also be defined as the conductance of a one-centimetre cube of the conductor.

It is represented by the symbol Kappa (κ). mathematically we can write

  • κ = 1/ p
  • ρ is resistivity
  • The conductivity, κ, of an electrolytic solution depends on the concentration of the electrolyte, nature of solvent and temperature.

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