First slide

Conductivity , Molar conductivity and Equivalent Conductivity

Question

At 25^oC, molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is $9.54 Ω^{- 1} {cm}^{2} {mol}^{- 1}$ and at infinite dilution, its molar conductance is $238 {ohm}^{- 1} {cm}^{2} {mol}^{- 1}$ . The degree of ionisation of ammonium hydroxide at the same concentration a4d temperature is

Easy

A

2.080 %
B

20.800 %
C

4.008 %
D

40.80 %

Solution

Given, molar conductance at 0.1 M concentration,
$λ_{c} = 9 .54 Ω^{- 1} {cm}^{2} {mol}^{- 1}$
Molar conductance at infinite dilution,
$λ_{c}^{\infty} = 238 Ω^{- 1} {cm}^{2} {mol}^{- 1}$
We know that, degree of ionisation,
$α = \frac{Λ^{C}}{λ^{\infty}} \times 100 = \frac{9 .54}{238} \times 100 = 4 .008 %$

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