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The OSMOTIC PRESSURE π of a dilute solution is given by:
A$\pi = CRT$ (van't Hoff equation)
B$\pi = nRT$ (gas law form)
C$\pi = m R / T$ (inverse of T)
D$\pi = K_b m$ (analogous to boiling)
Answer & Solution
Correct answer: A. $\pi = CRT$ (van't Hoff equation)
VAN'T HOFF equation for osmotic pressure: π = CRT, where C = molar concentration, R = gas constant, T = Kelvin. Used to measure molecular masses of biomacromolecules (proteins, polymers). Isotonic to blood = 0.9% NaCl.
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