Colligative Properties
Certain properties of solutions depend only on the number of dissolved particles and do not depend on the type of particles. Such properties are called colligative (collective) properties and include:
Vapor Pressure
Boiling Point
Freezing Point
Osmotic Pressure

By comparing values of solution to the pure solvent, it is possible to determine the number of solute particles present as well as molar mass. Particles make the same contribution whether they are small or large (polymers).

You have already seen something similar to a colligative property with the ideal gas law:
   PV = nRT
1 mol of any gas occupies 22.4 L at STP!
It makes no difference whether the gas is H2, He, O2, CO2, SO2, etc.