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Question

When will the conductivity become equal to the molar conductivity?


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Solution

Conductivity:

  • Conductivity is defined as the measure of the property of a substance to permit the flow of electricity through it.
  • It can be explained as the conductance of a solution of unit length (1 cm) having a unit cross-sectional area( 1 cm2).
  • It is denoted by κ and can be represented as: κ=1ρ, where ρ=Resistivity.

Molar Conductivity:

  • Molar conductivity is defined as the conductance of a solution having one mole of electrolyte between two electrodes separated by a unit length (1 cm) having a unit area (1 cm2).
  • Mathematically, it can be represented as:

m=κ/C, where κ= Specific Conductivity and C= Concentration( inmoll-1)

Equating Conductivity with Molar Conductivity:

  • When 1 mole of electrolyte is present in 1cm3 of solution between two electrodes of a cross-sectional area of 1 cm2 separated by a distance of 1 cm, then the conductivity will be equal to molar conductivity.

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