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Determine the osmotic pressure of a solution prepared by dissolving 25 mg of K2SO4 in 2 litre of water at 25°C, assuming that it is completely dissociated.

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Since K2SO4 is completely dissociated as K2SO4

→ 2K+ + SO42- 

Thus, i = 3

Osmotic pressure of the solution, π = i CRT

\(\frac{3\times25\times10^{-3}g\times0.0821\,L\,atm\,K^{-1}mol^{-1}\times298.15K}{174g\,mol^{-1}\times2L}\)

= 5.27 × 10-3 atm

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