An osmotic semipermeable membrane allows only water to pass...

An osmotic semipermeable membrane allows only water to pass separates two compartments, A and B. Compartment A contains $0.9 \% \mathrm{NaCl}$, and compartment B contains 3\% glycerol, $\mathrm{C}_{3} \mathrm{H}_{8} \mathrm{O}_{3}$ (a) In which compartment will the level of solution rise? (b) Which compartment (if either) has the higher osmotic pressure?

An osmotic semipermeable membrane allows only water to pass separates two compartments, A and
B. Compartment A contains $0.9 \% \mathrm{NaCl}$, and compartment B contains 3\% glycerol, $\mathrm{C}_{3} \mathrm{H}_{8} \mathrm{O}_{3}$
(a) In which compartment will the level of solution rise?
(b) Which compartment (if either) has the higher osmotic pressure?

Key Concepts

Colligative Properties

Colligative properties are characteristics of solutions that depend on the number of solute particles present, rather than their chemical identity. These properties include osmotic pressure, boiling point elevation, freezing point depression, and vapor pressure lowering, and they are crucial for understanding phenomena like osmosis in biological and chemical systems.

Osmotic Pressure

Osmotic pressure is the pressure required to stop the net flow of solvent across a semipermeable membrane due to osmosis. It is a colligative property, meaning it depends on the concentration of solute particles rather than their specific identity, and can be calculated using factors such as the solute’s molarity, the temperature, and the van 't Hoff factor which accounts for dissociation in electrolytes.

Electrolyte Dissociation

Electrolyte dissociation refers to the process by which ionic compounds, when dissolved in a solvent, separate into their constituent ions. This increases the number of solute particles in the solution, hence affecting the osmotic pressure. In contrast to non-electrolytes, the effective concentration of solute particles in an electrolyte solution is multiplied by the number of ions produced upon dissociation.

Osmosis

Osmosis is the process by which solvent molecules, typically water, move across a semipermeable membrane from a region of lower solute concentration (or lower osmotic pressure) to a region of higher solute concentration (or higher osmotic pressure). This movement continues until there is an equilibrium in the chemical potential of the solvent on both sides of the membrane.

Semipermeable Membrane

A semipermeable membrane is a barrier that allows certain molecules or ions to pass through by diffusion while blocking others. In the context of osmosis, such membranes permit the passage of solvent molecules (like water) but restrict solute particles, thereby enabling the generation of osmotic pressure differences between compartments.

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