Reverse Osmosis. semipermeable membrane pressure fresh water Reverse Osmosis salt water.

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Presentation transcript:

Reverse Osmosis

semipermeable membrane pressure fresh water Reverse Osmosis salt water

Reverse Osmosis Kelter, Carr, Scott, Chemistry A Wolrd of Choices 1999, page 267 Water Solution Pressure here Semipermeable membrane

The pressure required to allow for no transport of solvent across the membrane is called the OSMOTIC pressure and obeys the relation: Osmotic pressure has a great effect on living CELLS, because their walls are a semipermeable membrane.

The pressure required to allow for no transport of solvent across the membrane is called the OSMOTIC pressure and obeys the relation: Osmotic pressure has a great effect on living CELLS, because their walls are a semipermeable membrane. Pure solvent Solution Semipermeable membrane Net movement of solvent Solute molecules Solvent molecules Applied pressure needed to prevent volume increase Osmotic pressure  

Net flow of solvent Net Solvent Flow Dilute solution Concentrated solution Solute particleSolvent particle Ralph A. Burns, Fundamentals of Chemistry 1999, page 430 semipermeable membrane Net flow of solvent

Dissociate in Water

Dissolving of NaCl Timberlake, Chemistry 7 th Edition, page 287

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