Show an Experiment to show osmotic pressure anlong with daigram

Experiment to show osmotic pressure

A 10% sugar solution is taken in a funnel and separated from pure water in a beaker through a semi-permeable membrane.  

You can get this kind of a membrane in an egg. 

Remove the yolk and albumin through a small hole at one end of the egg, and place the shell in dilute solution of hydrochloric acid for a few hours. 

The egg shell dissolves leaving the membrane intact. 

Water will move into the funnel, resulting in rise in the level of the solution in the funnel.

This will continue till the equilibrium is reached. 

Now, to observe osmotic pressure, External pressure can be applied from the upper part of the funnel by putting for example 1 kg load on it. 

This load will exert pressure and no water will diffuse into the funnel through the membrane. 

This pressure required to prevent water from diffusing is in fact, the osmotic pressure.

more the solute concentration, greater will be the pressure required to prevent water from diffusing in.

You can experiment this by increasing the solute concentration of the solution. As the solute concentration increases, more external pressure will be required to prevent the movement of water from the funnel.