0
Rationalised 2023-24
50
Chemistry
then it can be approximated to the ratio of molar conductivity Lm  at the
concentration c to limiting molar conductivity, L
0
m Thus we have:
°
=
m
m



(2 26)
But we know that for a weak electrolyte like acetic acid (Class XI,
Unit 7),




2
2
2
2
=
=
=
a
1
1
m
m
m
m
m
m
m
m
c
c
c
K













 







(2 27)
Applications of Kohlrausch law
Using Kohlrausch law of independent migration of ions, it is possible to
calculate L
0
m  for any electrolyte from the lo of individual ions