Class 12 Chemistry Electrochemistry Variation of Conductivity and Molar Conductivity with Concen

Variation of Conductivity and Molar Conductivity with Concentration

  • They depend on the concentration of the electrolyte. The Conductivity and Molar Conductivity of both weak and strong electrolytes decreases withdecrease in concentration as the number of ions per unitvolume carrying the current in a solution decreases on dilution.

Fig. Variation of electrolytic conductivity

Fig. Variation of Molar conductivity 

  • Conductivity of a solution at a specific concentration = Conductance of solution placed in between the two platinum electrodes where
  • Volume of solution = 1 unit

 Cross sectional area of electrodes = 1unit

Distance = 1unit

  • Molar conductivity of a solution at a specific concentration = Conductance of solution where

Volume of solution = V

Concentration of electrolyte = 1 mole
Cross sectional area of electrodes = A

Distance = 1unit

  • When the concentration approaches to zero, the molar conductivity is referred to as limiting molar conductivity. It is represented by the symbol Ëom.

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