1. According to RaouIt’s law, for a solution containing a non volatile solute.
Psolution = P0solvent . xsolute
2. According to henry’s law, Psolution = KH . xsolute in solution.
3. The difference between the above two laws is the proportionality constant P° (Raoult’s law) and K (Heniys law).
4. henry’s law is applicable to solution containing gaseous solute in liquid solvent, while Raoult’s law is applicable to non volatile solid solute in the liquid solvent.
5. If the solute is non volatile then the Henry’s law constant will become equal to the vapour pressure of pure solvent Po. thus Raoult’s law becomes a special case of Henry’s law.
6. For very dilute solutions, the solvent obeys Raoult’s law and the solute obeys Henry’s law.
