Osmotic pressure does not depend on

(1) Temperature

(3) Molecular weight

(2) Degree of ionization

(4) Molar concentration

Osmotic Pressure:

Osmotic pressure is the pressure required to stop the flow of solvent through a semi-permeable membrane separating two solutions of different concentrations. It depends on the concentration of solute particles in the solution.

Formula for Osmotic Pressure:

The osmotic pressure (π) is given by the formula:

Where:

  • i is the Van’t Hoff factor (degree of ionization)
  • M is the molar concentration of the solute
  • R is the gas constant
  • T is the temperature in Kelvin

What does Osmotic Pressure depend on?

  • Temperature (T): As per the formula, osmotic pressure increases with temperature because temperature is directly proportional to osmotic pressure.
  • Molar concentration (M): Osmotic pressure is directly proportional to the molar concentration of solute particles. More solute = higher osmotic pressure.
  • Degree of ionization (i): If a solute ionizes into multiple ions (like NaCl → Na⁺ + Cl⁻), it increases the number of particles in the solution, which increases the osmotic pressure.

What does it not depend on?

  • Molecular weight: Osmotic pressure does not depend on the molecular weight of the solute directly. A larger molecule will affect the molar concentration, but osmotic pressure is more influenced by how many particles (ions or molecules) are present, not their size or mass.

Final Answer:

(3) Molecular weight — Osmotic pressure does not depend on the molecular weight of the solute.

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