Q. 12

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Answer :

Given, K, conductivity of HCOOH = 5.25 10-5 Scm-1,


Molarity of HCOOH, M = 0.025 M,


(H+) = 349.6 Scm2mol-1 and


°(HCOO-) =54.6 Scm2mol-1


Molar conductivity, m = 46.1 Scm2mol-1


According to Kohlrauch’s Law, limiting molar conductivity of an electrolyte can be represented as sum of individual contribution of cation and anion of electrolyte.


Therefore, limiting molar conductivity of HCOOH can be written as,


°m (HCOOH) = °m (HCOO-) + °m (H+)


= 54.6 Scm2mol-1 + 349.6 Scm2mol-1


= 404.2 Scm2mol-1


Degree of dissociation,


= 0.114


Dissociation constant, K =


= = 3.67


Degree of dissociation and dissociation constant of methanoic acid is 0.114 and 3.67respectively.


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