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A 0.004 M solution of Na(2)SO(4) is isot...

A `0.004 M` solution of `Na_(2)SO_(4)` is isotomic with a `0.01 M` solution of glucose at same temperature. The apparent degree of dissociation of `Na_(2)SO_(4)` is:

A

`25%`

B

`50%`

C

`75%`

D

`85%`

Text Solution

Verified by Experts

The correct Answer is:
c
Since the solutions are isotonic, They have the same osmotic pressure also.
`pi_(Na_(2)SO_(4))=pi_("glucose")`
`ixx0.004 RT = 0.01 RT`
`i=0.01/0.004=2.5`
`Na_(2)SO_(4)hArr2Na^(+)+SO_(4)^(2-)`
`alpha=(i-1)/(n-1)=(2.5-1)/(3-1)=1.5/2`
=0.75 or 75%
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