Multiple Choice
What is the osmotic pressure (in atm) of an aqueous solution that contains 162.1 g of glucose (C₆H₁₂O₆) in 1.50 L of solution at 295 K? (R = 0.0821 L·atm/mol·K, Molar mass of glucose = 180.18 g/mol)
14. Solutions
Osmotic Pressure
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Which of the following factors is responsible for the osmotic pressure of a solution?
A
Pressure of the gas above the solution
B
Concentration of solute particles
C
Temperature of the solution
D
Volume of the solvent
Verified step by step guidance1
Understand that osmotic pressure is a colligative property, which means it depends on the number of solute particles in a solution, not their identity.
Recognize that the formula for osmotic pressure (π) is given by: , where i is the van't Hoff factor, c is the molar concentration of the solute, R is the ideal gas constant, and T is the temperature in Kelvin.
Identify that the concentration of solute particles directly affects the osmotic pressure, as seen in the formula where c is a key component.
Note that while temperature (T ) is part of the formula, the problem specifically asks for the factor responsible for osmotic pressure, which is primarily the concentration of solute particles.
Conclude that the pressure of the gas above the solution and the volume of the solvent do not directly influence the osmotic pressure, reinforcing that the concentration of solute particles is the correct factor.
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