Multiple Choice
In an experiment involving a selectively permeable membrane and solutions of starch and iodine, did starch diffuse through the membrane?
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6. The Membrane
Osmosis
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When testing osmosis using a thistle tube filled with a sucrose solution and placed in pure water, what observation would indicate that osmosis is occurring?
A
The liquid level in the thistle tube rises over time.
B
Bubbles form at the surface of the sucrose solution.
C
The liquid level in the thistle tube falls over time.
D
The liquid level in the thistle tube remains unchanged.
Verified step by step guidance1
Understand the concept of osmosis: Osmosis is the movement of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.
Identify the setup: The thistle tube contains a sucrose solution, which has a higher solute concentration compared to the pure water outside the tube. The selectively permeable membrane allows water to move but restricts sucrose molecules.
Predict the direction of water movement: Water will move from the pure water (low solute concentration) into the sucrose solution (high solute concentration) due to osmosis.
Determine the observable effect: As water enters the thistle tube, the volume of the sucrose solution increases, causing the liquid level in the thistle tube to rise over time.
Eliminate incorrect observations: Bubbles forming, the liquid level falling, or remaining unchanged do not align with the principles of osmosis in this setup.
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