semipermeablemembrane pressure

freshwater

Reverse Osmosis

saltwater

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.

T R M T R V

n

solute

solute

Puresolvent

Solution

Semipermeablemembrane

Netmovementof solvent

SolutemoleculesSolventmolecules

Applied pressureneeded to preventvolume increase

Osmoticpressure

Net flow of solvent

Net Solvent Flow

Dilutesolution Concentrated

solution

Solute particle Solvent particle

Ralph A. Burns, Fundamentals of Chemistry 1999, page 430

semipermeable membrane

Net flow of solvent

Dissociate in Water