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The molar mass of the solute sodium hydr...


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

A

75

B

60

C

80

D

70

Text Solution

Verified by Experts

The correct Answer is:
B
`i= ("Normal molar mass")/("Abnormaal molar mass") alpha= (i-1)/(n-1)`
`i=1 + alpha` for binary electrolyte
`therefore 1+ alpha = (40)/(25), alpha= 0.6` % ionisation =60
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