Oct_15 - Osmosis Osmosis is a property seen when a semi-permeable membrane separates solutions of different composition Some important membrane

Oct_15 - Osmosis Osmosis is a property seen when a...

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Osmosis In the example left, the water (permeable) is moving to equilibrate sugar concentration Osmosis is a property seen when a semi-permeable membrane separates solutions of different composition Some important membrane materials are Gore-Tex(water vapour) and Nafion (cations)
Osmotic Pressure Solvent flow will raise solution level This creates a pressure differential Equilibrium is reached when solvent migration is balanced by the pressure difference
Osmotic Pressure You can predict osmotic pressure (π) from π ≈ c R T or c = solute concentration (mol/L) R = Ideal Gas Constant c is the concentration of solute particles and doesn't depend on the type of solute Reversible by applying this pressure to the concentrated side → reverse osmosis.
ExampleWhat pressure is needed to desalinate seawater which is approximately 3% w/w NaCl at 15°C?
Raoult's Law for 2 Components

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