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Define conductivity and molar conductivi...

Define conductivity and molar conductivity for the solution of an electrolyte. Discuss their variation with concentration.

Text Solution

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Conductivity is defined as ease with which current flows through electrolyte. It is reciprocal of specific resistance. Molar conductivity is conductance of all the ions produced by one mole of electrolyte when electrodes are at unit distance apart and have sufficient area of cross-section to hold electrolyte.
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(a) Define the terms conductivity and molar conductivity for the solution of an electrolyte. Comment on their variation with temperature (b) The measured resistance of a conductance cell was 100 ohms. Calculate (i) the specific conductance and (ii) the molar conductance of the solution (KCl=74.5 g mol^(-1) and cell constant =1.25 cm^(-1))

Variation OF Conductivity and Molar Conductivity With Dilution

Knowledge Check

  • The molar conductivity of strong electrolyte

    A
    Increases on dilution slightly
    B
    Does not change on dilution
    C
    Decreases on dilution
    D
    Depends on density of electrolyte itself

  • For a dilute solution of a strong electrolyte, the variation of molar conductivity with concentration is given by

    A
    `wedge_(m)=wedge^(@)._(m)+Ac`
    B
    `wedge_(m)=wedge^(@)._(m)-Ac`
    C
    `wedge_(m)=wedge^(@)._(m)+Asqrt(c)`
    D
    `wedge_(m)=wedge^(@)._(m)-Asqrt(c)`

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    Define limiting molar conductivity. Why conductivity of an electrolyte solution decreases with decrease in concentration ?

    Define limiting molar conductivity. Why does conductivity of an electrolyte decrease with discrease in concentration.

    Express the relation between.conductivity and molar conductivity of a solution.

    (a) Apply Kohlrausch law of independent migration of ions, write the expression to determine the limiting molar conductivity of calcium chloride. (b) Given are the conductivity and molar conductivity of NaCI solutions at 298 K at different concentrations : Compare the variation of conductivity and molar conductivity of NaCI solutions on dilution. Give reason. (c) 0.1 M KCI solution offered a resistance of 100 ohms in conductivity cell at 298 K. If the cell constant of the cell is 1.29 cm^(-1) , calculate the molar conductivity of KCI solution.

    Resistivity is reciprocal of molar conductivity of electrolyte.

    Define the following terms: Molar conductivity

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