Question

In this funnel experiment, what will happen if sugar is added to the beaker after the stoppage of osmosis?
a. Level of solution in beaker lowers.
b. Level of solution in the thistle funnel rises up.
c. Level of solution remains unaffected in the beaker.
d. Level of solution in thistle funnel lowers.

Answer 1

Hint: The mouth of the thistle funnel is tied with semipermeable membrane and thistle funnel is filled with the sugar solution and kept inverted into the distilled water. Then start the reading of the thistle funnel inside sugar and gradually water enters inside the thistle funnel according to the osmosis process.

Complete answer:
With the help of the semipermeable membrane water starts entering into the thistle funnel and maintains the equilibrium. And after some time gradually the sugar solution level increases in the thistle funnel and stops the equilibrium after developing the hydrostatic pressure inside the thistle funnel.

The pure solvent amount of solute is absent because solute and solvent make a mixture of solution, and it contains a small amount of water from the pure solvent. And osmotic pressure is less in the solvent as compared to the solution. The concentration of water molecules in the beaker more than the thistle funnel. The movement of water molecules moves from the region of higher concentration to Lower concentration. Level of thistle funnel is lower and process happens through the osmosis.

Hence, the correct answer is option (D).

Note: Thistle funnel attached with the goat bladder and act as semipermeable membrane and funnel filled with concentrated solution. Water enters in the thistle funnel and increases the level of the solution low concentration to higher concentration. Level of solution increases and thistle funnel solution decreases.