Question

Define Colligative Properties and provide two examples.

Hint:

Colligative properties depend only on the number of solute particles — not their identity.

Answer 1

Concept: Colligative properties are physical properties of solutions that depend only on the number of solute particles present, rather than their chemical identity. These properties are especially significant for dilute solutions.
Step 1: Definition. Colligative properties are those properties of a solution that depend on the ratio of the number of solute particles to solvent molecules, regardless of the nature of the solute.
Step 2: Key characteristic. They depend on concentration (number of particles) and not on:

• Chemical nature of solute
• Molecular structure
• Type of bonding

Step 3: Examples of colligative properties. Any two examples:

• Lowering of vapor pressure
• Elevation of boiling point
• Depression of freezing point
• Osmotic pressure

Conclusion: Colligative properties are important in understanding solution behavior and depend solely on the number of solute particles present.