a solvent and its solutions containing a non volatile solute are separated by a semi permable membrane.Does the flow of solvent occur in both directions? comment giving a reason
Answers
Answer:
Gujjar Bakarwals: Gujjar Bakarwals live in the mountains of Jammu & Kashmir. They herd goat and sheep. They migrated to this region in the nineteenth century and established in this area. They move between their winter and summer grazing grounds every year. During winter the high mountains are covered with snow. During this season, they move to the low hills of the Shiwalik. By the end of April, they begin their march towards higher mountains.
Gaddi: The Gaddi shepherds live in Himachal Pradesh. They also spend winter in the low hills of the Shiwalik. By April, they move towards north to spend summers in Lahul and Spiti.
Answer:
(1) When a solvent and a solution containing a non-volatile solute are separated by a semipermeable membrane, there arises a flow of solvent molccules from solvent to solution as well as from solution to solvent.
(2) Due to higher vapour pressure of solvent than solution, the rate of flow of solvent molecules from solvent to solution is higher.
(3) As more and more solvent passes into solution due to osmosis, the solvent content increases, and the rate of backward flow increases.
(4) At a certain stage an equilibrium is reached where both the opposing rates become equal attaining an equilibrium.
Osmotic pressure is the tendency of solvent molecules to move in the direction of lower solvent activity. It plays a central role in biology.