Estimate osmotic pressure using van't Hoff's law (ideal solutions).
Osmotic Pressure (Π)
0.0000 atm
Π = i M R T
Osmotic pressure is the minimum pressure required to stop solvent flow through a semipermeable membrane into a solution. For ideal dilute solutions, van't Hoff's law approximates Π ≈ iMRT.
Provide molarity (mol/L), temperature (K) and the van't Hoff factor i. The result is in atm for the chosen units.
For 0.1 M NaCl (i≈2) at 298.15 K: Π ≈ 2 × 0.1 × 0.08206 × 298.15 ≈ 4.89 atm.
Q: Are non-ideal solutions covered? A: No — this is for ideal/dilute approximations. Q: Units? A: Use mol/L, K, and R=0.08206 L·atm/(mol·K).
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