Question

Why do we get abnormal molecular masses from colligative properties?

Answer 1

If a solute associates in the solution, the number of particles present in the solution will be less than the actual number dissolved and hence the value of osmotic pressure and other colligative properties will be smaller and consequently the molecular mass indicated will be higher than the true molecular mass.

Answer 2

Answer:

If a solute associates in the solution, the number of particles present in the solution will be less than the actual number dissolved and hence the value of osmotic pressure and other colligative properties will be smaller and consequently the molecular mass indicated will be higher than the true molecular mass