1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

# Which of the following statement is correct for a weak electrolytic solution? Λm - Molar conductivity Λ0m - Limiting molar conductivity C - concentration of electrolyte

A
Λ0m cannot be found by extrapolation of Λm to zero concentration.
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
On dilution, molar conductivity increases due to decrease in ion-ion forces of attraction.
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
Plot of Λ0m vsC will give a straight line.
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
Λ0m can be found by extrapolation of Λm to zero concentration.
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

## The correct option is A Λ0m cannot be found by extrapolation of Λm to zero concentration.On dilution, the molar conductivity increases for both strong and weak electrolyte. On dilution of weak electrolyte, the degree of dissociation increases which results in increase in the number of ions in solution. So, there will be overall increase in molar conductance. Variation in Λm for weak electrolyte: Weak electrolytes like acetic acid have lower degree of dissociation. With dilution of an ionic solution, the degree of dissociation (α) of the electrolyte increases which result in increase in the number of ions in solution. Near lower concentration, there will be a steep increase in molar conductance. Plot of Λm vs √C From above it is evident that curve for Λm vs √C for a weak electrolyte (here acetic acid) is rectangular hyperbola. It does not intercept the y-axis. Although, the concept of molar conductance at infinite dilution exists for a weak electrolyte. But graphically, the value cannot be evaluated. Thus, statement (a) is correct.

Suggest Corrections
1
Join BYJU'S Learning Program
Explore more
Join BYJU'S Learning Program