Two aqueous solutions, Solution X and Solution Y, are separated by a semipermeable membrane. Solution X has a higher concentration of a non-ionizing solute compared to Solution Y. Assuming identical temperatures, which statement correctly describes the initial net movement of water and the resulting osmotic pressure?
Show answer and explanation
The answer
Correct answer: C. Water will initially move from Solution Y into Solution X, causing Solution X to exert a higher osmotic pressure.
Tested concept: Osmotic pressure
Explanation
Osmotic pressure is a colligative property that depends on the concentration of solute particles. Water moves from an area of lower solute concentration (higher water potential) to an area of higher solute concentration (lower water potential) across a semipermeable membrane. Since Solution X has a higher solute concentration than Solution Y, water will initially move from Solution Y into Solution X. This movement increases the volume and pressure on the side of Solution X, which is associated with a higher osmotic pressure. Distractor 1 incorrectly reverses the direction of water flow and the assignment of higher osmotic pressure. Distractor 2 incorrectly suggests no net movement, ignoring the concentration gradient that drives osmosis. Distractor 3 describes a state of equilibrium, but the question asks about the initial net movement and the resulting osmotic pressure, which is established by the concentration difference, not necessarily by equalizing concentrations.
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