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Osmotic pressure of a dilute solution is expressed by van't Hoff's equation as:
A$\pi = CRT$
B$\pi V = nR$
C$\pi = nRT$
D$\pi = RT/C$
Answer & Solution
Correct answer: A. $\pi = CRT$
For a dilute solution behaving ideally, $\pi = C R T$, where $C$ is the molar concentration of solute, $R$ the gas constant and $T$ the absolute temperature. Equivalently $\pi V = n R T$, structurally identical to the ideal-gas equation with osmotic pressure playing the role of $p$.
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