Question

Which of the following colligative properties can provide molar mass of Proteins, Polymers and colloids with greater precision?

• A. Depression in Freezing Point
• B. Relative lowering of vapour pressure
• C. Osmotic Pressure
• D. Elevation in boiling point

Answer 1

Answer: (C)

Osmotic Pressure

Answer 2

Osmotic pressure is a colligative property that depends on the number of solute particles present in a solution, regardless of their nature. In the case of proteins, polymers, and colloids, these substances are often too large to accurately determine their molar mass using other colligative properties such as depression in freezing point or elevation in boiling point. These properties are more suitable for smaller molecules and non-volatile solutes.
However, osmotic pressure is not affected by the size or nature of the solute particles. It depends solely on the concentration of solute particles in the solution. By measuring the osmotic pressure and using the ideal gas law equation, the molar mass of proteins, polymers, and colloids can be determined with greater precision.
Therefore, the correct answer is (C) Osmotic Pressure.