COLLIGATIVE PROPERTIES

Colligative properties depend only on the osmolarity, i.e. number of dissolved particles in solution and not on their chemical nature (types of solutes). Non-colligative properties depend on the identity of the dissolved species and the solvent.

Increase of solution osmolarity causes:
 * Osmotic pressure increase
 * Vapour pressure decrease
 * Freezing point decrease
 * Boiling point increase

They have following consequences:
 * Solution with higher osmolarity stays as liquid over larger range of temperatures compare to solution with lower osmolarity.
 * The reduction of vapour pressure of a solvent is proportional to the molar concentration of the solute (Raoult's law).