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Question

# Which of the following statement(s) is/are correct ? Λm - Molar conductivity Λ0m - Limiting molar conductivity C - concentration of electrolyte

A
Molar conductivity of a strong electrolyte increases with dilution
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B
Variation of molar conductivity for strong electrolyte is given by,
Λm=Λ0mAC
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C
Molar conductivity of a strong electrolyte decreases with dilution
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D
Λ0m for a strong electrolyte can be found from the plot of Λm vs Cby extrapolation of Λm to zero concentration
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Solution

## The correct option is D Λ0m for a strong electrolyte can be found from the plot of Λm vs √Cby extrapolation of Λm to zero concentrationOn dilution, the molar conductivity increases for both strong and weak electrolyte. For strong electrolyte it increases due to decreased ion- ion force of attraction. As strong electrolytes are mostly in ionized state, no abrupt change in the number of ions with dilution. Thus, Λm increases slowly with dilution. In concentrated solution there will be a strong attraction between ions which slows down the movement of ion. On dilution of strong electrolyte, distance between the ions increases which results in decrease in ion-ion attraction. So, there will be overall increase in molar conductance of the solution. Variation in molar conductivity of strong electrolyte due to ion-ion interaction is given by an empirical relation proposed by kohlrausch. Λm=Λ0m−A√C Λm - Molar conductivity Λ0m - Limiting molar conductivity C is concentration of electrolyte A is constant for a given solvent and temperature. Λm=Λ0m−A√C This equation is in the form of straight line equation, y=c+mx ∴ Plot of Λm vs √C Intercept : Λ0m Slope : −A Thus, the extrapolation of line gives Λ0m for strong electrolytes.

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