a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one.

Aim of the ExperimentTo demonstrate Osmosis process by Thistle funnel and egg's membrane.

Requirements:-Beaker, Water, Sugar solution, Egg's membrane, an iron stand.

Procedure for the experimentA wide mouthed thistle funnel with a narrow long stem was taken. Then an egg's membrane collected from an egg is tied tightly around the wide mouth of the funnel with the help of a thread or rubber band. Now dilute sugar solution is carefully poured into the stem of the funnel to a certain level. The wide mouth of the funnel containing sugar solution is now kept in a beaker with the help of an Iron stand. Now three fourths of the beaker is filled with plain water. A similar control setup also arranged but by taking plain water in the beaker and also plain water in Thistle Funnel. The apparatus are left undisturbed for 10 minutes and we observe the changes in the experimental setup as well as in control setup.

ResultAfter few hours we find the level of sugar solution increases from its initial level in the experimental setup while there is no change in the level of water in the stem of Thistle Funnel in the control setup. This observation clearly indicates the movement of water molecules occurred from the beaker into Thistle Funnel in the case of experimental setup while in the control setup that there is no movement of water molecules from beaker into Thistle Funnel through egg's membrane because both the solutions are of same concentration.

Precautions:-The egg's membrane has to be tightly fastened to the mouth of the funnel.The initial level of sugar solution in the thistle funnel should be carefully noted.

Osmosis is the movement of water molecules from the region of higher concentration to their region of lower concentration through a semipermeable membrane