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:

  • Option 1)

    40.800%

  • Option 2)

    2.080%

  • Option 3)

    20.800%

  • Option 4)

    4.008%

 

Answers (1)

Degree of (\alpha )=\frac{molar \: conductivity\: at \: conc.c(\wedge ^{c}_{m})}{molar \: conductivity \:at \:infinite\: dilution(\wedge ^{\infty }_{m}) }

(\alpha )=\frac{9.54\Omega ^{-1}cm^{2}mol^{-1}}{238\Omega ^{-1}cm^{2}mol^{-1}}

=0.04008

=4.008%


Option 1)

40.800%

Option is incorrect

Option 2)

2.080%

Option is incorrect

Option 3)

20.800%

Option is incorrect

Option 4)

4.008%

Option is correct

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