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Osmotic Pressure

Calculate π...

Question

Calculate $π$ of a solutions having $0.1$ M NaCl & $0.2 M N a_{2} S O_{4}$ and $0.5$ HA (weak acid which is $20 %$ dissociation solutions at $300$ K)

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Solution

Osmotic pressure $π = Σ i_{n} C_{n} R T$
Here $π_{N a C l} = 0.1 \times 2 R T, π_{N a_{2} S O_{4}} = 0.2 \times 3 R T$ & $π_{H A} = 0.5 R T \times 1.2$
$\Rightarrow π = 0.0821 \times 300 (0.2 + 0.6 + 0.6)$
$\Rightarrow π = 34.482 a t m$

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