Physical Chemistry

The equivalent conductance of M/32 𝑠𝑜𝑙𝑛 of a weak monobasic acid is 8 mho cm^2 and at infinite dilution is 400 mho cm^2. The dissociation constant of this acid is

Sarthak Khandelwal

8 Years agoGrade

2 Answers

Arun

Approved Tutor Answer8 Years ago

The degree of dissociation is related to equivalent conductance and equivalent conductance at infinite dilution :
The degree of dissociation α = Λ(equivalent conductance at given dilution)/Λ∞(equivalent conductance at given dilution)
= 8 mho cm2/400 mho cm2
Dissociation constant of an acid Ka = C α2
= 1/32 M x (8 mho cm2/400 mho cm2)2
= 1.25 x 10-5

Kushagra Madhukar

6 Years ago

Dear student,

Please find the attached answer to the problem

The degree of dissociation is related to equivalent conductance and equivalent conductance at infinite dilution :

The degree of dissociation α = Λ(equivalent conductance at given dilution)/Λ∞(equivalent conductance at given dilution)
= 8 mho cm2/400 mho cm2
Dissociation constant of an acid Ka = C α2
= 1/32 M x (8 mho cm2/400 mho cm2)2
= 1.25 x 10-5

Hope it helps.

Thanks and regards,

Kushagra