Question

Pchem. Please show work . this is one whole problem

1) An aqueous solution of osmotic pressure 5 bar is separated by a semipermeable membrane from an aqueous solution of osmotic pressure 2 bar. Which way will the solvent flow? How Large a pressure must be applied to prevent this solvent flow?

Answer 1

The solvent flow from higher concentration region into lower concentration region is called osmosis.

Since osmotic pressure is proportional to the concentration of the solution. Solution with higher osmotic pressure is the higher concentrated solution.

So, solvent flow from the solution of osmotic pressure 5 bar into solution of osmotic pressure 2 bar.

Solvent flow can be prevented only when the pressures on both sides of the membrane are the same.

The pressure change = 5 bar - 2 bar = 3 bar

So, more than 3 bar pressure must be applied to prevent the solvent flow.