At 25° C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm-1 cm2 mol-1 and at infinite dilution its molar conductance is 238 ohm-1 cm2 mol-1. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is :

Question

At 25° C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm-1 cm2 mol-1 and at infinite dilution its molar conductance is 238 ohm-1 cm2 mol-1. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is : (A) 40.800% (B) 2.080% (C) 20.800% (D) 4.008%

Tardigrade Admin · Accepted Answer

% α = (λc /λ∞) × 100 = (9.54/238) × 100 = 4.008 %

Q. At 25∘C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54ohm−1cm2mol−1 and at infinite dilution its molar conductance is 238ohm−1cm2mol−1. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is :

40.800%

2.080%

20.800%

4.008%

%α=λ∞λc​×100=2389.54​×100=4.008%

$% α = \frac{λ ^{c}}{λ ^{\infty}} \times 100 = \frac{9.54}{238} \times 100 = 4.008%$