Question

Hlooo


What is Osmosis !?​

Answer 1

Osmosis

Osmosis refers to two solutions of different concentrations separated by a semi-permeable membrane ( membrane that allows solvent molecules to pass, not solute molecules to pass), water molecules or other solvent molecules from low-concentration solutions through the semi-permeable membrane into high concentration Phenomenon in solution. Or

• The phenomenon that water molecules move from the higher water potential to the lower water potential through the semi-permeable membrane.

Principle

The phenomenon of water molecules moving from a system with high water potential through a semi-permeable membrane to a system with low water potential is called osmosis. Therefore, there are two conditions for the occurrence of osmosis:

• There is a semi-permeable membrane.
• There is a difference in the amount and concentration of substances on both sides of the semi-permeable membrane.

Experiment description

Tie the broad bean seed coat (or animal bladder membrane) tightly on the funnel, inject the sucrose solution, and then immerse the whole device in a beaker filled with fresh water, the liquid level inside and outside the funnel is equal. Because the broad bean seed coat is close to a semipermeable membrane (a membrane that allows water molecules to pass through while sucrose molecules cannot penetrate), the entire device becomes a permeable system. In an osmotic system, the direction of water movement depends on the water potential of the solution on both sides of the semi-permeable membrane. Water from a solution with a high water potential flows to a solution with a low water potential. In fact, the water molecules on both sides of the semi-permeable membrane can pass freely, but the water potential of the clear water is high, and the water potential of the sucrose solution is low. There are more water molecules from the clear water to the sucrose solution than from the sucrose solution to the clear water, so in appearance The water in the beaker flows into the funnel, the liquid level in the glass tube in the funnel rises, and the hydrostatic pressure also begins to increase. As the water gradually enters the glass tube, the more the liquid level rises, the greater the hydrostatic pressure, the faster the pressing water moves from the glass tube to the beaker, and the water inlet and outlet speeds inside and outside the membrane are getting closer and closer. In the end, the liquid level no longer rises and stays still. In essence, the water enters and exits at the same speed, showing a dynamic balance .