Question

c and Mac are molar conductivities of a monobasic weak acid at concentration C and at infinite dilution respectively. The acid dissociation const omputed as С. (A) (B) CNC (C) (D) C​

Answer 1

Answer: Correct option is D)

The degree of dissociation, α=

Equivalent conductance at infinite dilution

Equivalent conductance at given dilution

=

100cm

2

eq

−1

5cm

2

eq

−1

=

20

1

For weak monobasic acid,

K

a

=

1−α

Cα

2

=Cα

2

(∵1>>α)

=0.01×(

20

1

)

2

=2.5×10

−5