What is osmotic pressure ? Why it is a colligative property ?

Which is not a colligative property?

Colligative properties

van't Hoff proved that osmotic pressure ( pi ) is a colligative property. For an ideal solution, osmotic pressure( pi ) is helpful to determine that molecular mass of solute using M_(B)=(W_(B)RT)/(pi.V) Relation can exxpressed by the curve (C = concentration) :

(i) Prove that osmotic pressure is a colligative property. (ii) Calculate the molar of urea solution if it exerts an osmotic pressure of 2.45 atmosphere at 300K. (R = 0.0821 L atm. mol^(-1) K^(-1) ).

Colligative Properties

Colligative Properties