First slide

Conductivity , Molar conductivity and Equivalent Conductivity

Question

At 25°C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is $9 .54 {ohm}^{- 1} {cm}^{2} {mol}^{- 1}$ 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 and temperature is

Moderate

Solution

Degree of dissociation $(α) = \frac{Molar conductivity at given conc . (Λ_{m}^{c})}{Molar conductivity at infinite dilution (Λ_{m}^{\infty})}$
$% α = \frac{9 .54 Ω^{- 1} {cm}^{2} {mol}^{- 1}}{238 Ω^{- 1} {cm}^{2} {mol}^{- 1}} \times 100 = 0 .04008 \times 100 = 4 .008 %$

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