Question

Applications of Kohlrausch’s law ?* Determination of Dissociation constant Degree of dissociation Solubility of sparingly soluble salts All the above​

Answer 1

Answer:

Kohlrausch's law :

The value of molar conductance at infinite dilution is give by the sum of the contributions of ions (Cation and anion)

λ

m

∞

=xλ

+a

∞

+yλ

−e

∞

λ

+2

and λ

−e

ionic conductance of cation and anion x and y = no. of ions.

Two applications

(i) Calculation of molar conductance at infinite dilution for weak electrolytes

λ

m

∞

(CH

3

COOH)=λ

∞

CH

3

COO+λ

H+

∞

(ii) Determination of degree of dissociation of weak electrolyte. If at any concentration C the value of molar conductance is λ

m

e

then

a=

λ

m

∞

λm

e

d = degree of dissociation

(iii) Dissociation constant for weak electrolvte.

(iv) Determination of solubility of sparingly soluble salt.

(v) Determination of ionic product of water.