Question

Which of the following method is used for the determination of osmotic pressure?

• A. Beckmann's method
• B. Berkeley and Hartley's method
• C. Cottrell's method
• D. Landsberger's method

Answer 1

The Correct Option is B

To determine which method is used for measuring osmotic pressure, we need to understand each option:

1. Beckmann's method: This method is primarily used for measuring colligative properties such as boiling point elevation and freezing point depression, not osmotic pressure.
2. Berkeley and Hartley's method: This method is specifically designed for the determination of osmotic pressure. In this method, a semi-permeable membrane is used, allowing solvent but not solute particles to pass through. This creates a pressure difference equivalent to the osmotic pressure.
3. Cottrell's method: This method is commonly associated with determining the degree of dissociation of electrolytes in a solution rather than osmotic pressure.
4. Landsberger's method: This technique is primarily used for determining molecular weights using vapor pressure measurements, not osmotic pressure.

Based on the above analysis, the correct method for determining osmotic pressure is Berkeley and Hartley's method. It involves using a semi-permeable membrane to measure the osmotic pressure directly.

It is important to note that osmotic pressure is a crucial colligative property that depends on the number of solute particles in a solution, and this method exploits that property effectively.