Determine the osmotic pressure of a solution prepared by ...

CBSE Class 12 Chemistry 2013 Solved Paper

Question : 20

Total: 30

Determine the osmotic pressure of a solution prepared by dissolving 2.5×10−2g of K2SO4 in 2L of water at 25°C, assuming that it is completely dissociated.
(R=0.0821L1atmK‌−1mol−1., Molar mass of K2SO4 =174gmol−1)

Solution:

Reaction is:
K2SO4→2K++SO42−
No. of produced ions =3
π=iCRT
π=

3×0.025×0.0821×0.5×298

174

0.917

174

=0.00527
=5.27×10−3atm

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