Why is the mass determined by measuring a colligative property in case of some solutes abnormal? Discuss it with the help of van't Hoff factor.

Explanation

To understand why the mass determined by measuring a colligative property for some solutes is abnormal, we need to explore the concepts of dissociation and association of solutes, as well as the Van't Hoff factor.

### Step-by-Step Solution:

1. **Definition of Colligative Properties**:
Colligative properties depend on the number of solute particles in a solution rather than the identity of the solute. Examples include boiling point elevation, freezing point depression, vapor pressure lowering, and osmotic pressure.

**Hint**: Remember that colligative properties are influenced by the number of particles, not their type.
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