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The molar mass of the solute sodium hydr...

The molar mass of the solute sodium hydrdoxide obtained from the measurement of the osmotic pressure of its aqueous solution at `27^(@)C` is `25 g mol^(-1)`. Therefore its ionization percentage in this solution is

A

75

B

60

C

80

D

70

Text Solution

Verified by Experts

The correct Answer is:
B
In case of ionisation of binary electrolyte
Abnormal molecular mass `=(M_("normal"))/(1+alpha)`
Abnormal molecular mass = 25
So, `25=(40)/(1+alpha)`
`alpha=0.6`
Ionisation percentage = `0.6xx100=60%.
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