Osmotic Pressure
Osmotic pressure (π) of a dilute solution relates to concentration via:
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About This Question
- Subject
- chemistry
- Chapter
- solutions
- Topic
- osmotic pressure
- Difficulty
- Easy
- Year
- 2025
Solution
- van't Hoff Equation: Analogous to the ideal gas law (PV=nRT), dilute solutions follow πV=nRT.
- Concentration (c): Since n/V is the Molar concentration (c or M),
- Equation: π=cRT.
- π: Osmotic pressure (measured in atm or bar).
- c: Molarity (mol/L).
- R: Gas constant (0.0821L⋅atm/K⋅mol).
- T: Absolute temperature (Kelvin).
- Application: This is the most suitable colligative property for determining the molar masses of large biomolecules (like proteins) due to measurable pressures even at low concentrations.
This easy difficulty chemistry question is from the chapter solutions, covering the topic of osmotic pressure. It appeared in the 2025 exam.
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