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Electrochemistry

Question
CBSEENCH12005945

How does molar conductance of a strong electrolyte vary with its concentration in solution?

Solution
The molar conductivity of a strong electrolyte like KCl decreases slightly as the concentration is increased. This is because greater inter ionic attractions retard the motion of the ions and therefore molar conductivity decreases.
At low concentrations, the molar conductance of strong electrolyte can be expressed by the relationship.

Λm = Λm - KC

where
Λm = molar conductance at concentration C.
Λm = molar conductance at infinite dilution.
K = constant
C = concentration of solution on molar scale.