Coligative properties

Coligative properties

1. Boiling point elevation

   • The boiling point of a solvent is increased when adding another compound.
   • The solution has a higher boiling point than the pure solvent.
   • Example
     • Cooking: adding salt while boiling water will increase its boiling point, so it is actually hotter

2. Osmosis

   • Diffusion between two liquids or gases which are able to mix through a semipermeable membrane.
   • Example
     • The absorption of water through the alimentary canal from stomach, small intestine and colon.

3. Freezing point depression

   • The freezing point of a solvent is lowered by adding another compund.
   • The solution has a lower freezing point than the pure solvent.
   • Example
     • Antifreeze: ethylene glycol prevents the water in cars' radiators from freezing.