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Question
CBSEENCH12005792

Why is Van’t Hoff factor introduced in the equation for colligative properties of solutions?

Solution

van’t Hoff factor modifies the equations for colligative
properties as follows:
Relative lowering of vapour pressure of solvent,

p10 - p1p10 = in2n1

Elevation of Boiling point, ΔTb = i Kb m
Depression of Freezing point, ΔTf = i Kf m
Osmotic pressure of solution, Π = i n2 R T / V
 thus it shows that van't hoff factor depend on solute such that it is a colligative properties.