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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:

1. (a) 20.80%
2. (b) 4.008%
3. (c) 40.800%
4. (d) 2.080%

Correct answer: (b) 4.008%

Solution

The degree of ionization (α) is calculated using the formula α = Λc / Λ∞. Substituting the given values, α = (9.54 / 238) × 100 = 4.008%.

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