Raoult’ s law as special case of Henry’ s law
Vapour pressure of a liquid-liquid solution
Raoult’ s law as special case of Henry’ s law
o At a given temperature liquids vaporize. At equilibrium the pressure exertedby the vapour of the liquid over the liquidphase is referred to as vapour pressure.
o According to Raoult’ s law, vapour pressure of a volatile component in a given solution ca be defined by pi = pi 0 xi o
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In an answer of a gas in a fluid one of the segments is volatile to the point that it exists as a gas and solvency is given by Henry ' s law which expresses that p = KHx
Comparing both the equations we get that partial pressure of the volatile component or gas is directly proportional to its mole fraction in solution. Proportionality constant KH differs from p1 0
Therefore, Raoult ' s law turns into a unique instance of Henry’ s law in which KH get to be equivalent to p1 0.
Vapour pressure of a liquid-liquid solution
o Acetic acid in water is a liquid-liquid solution. Similarly lemon juice added to water for making lemonade is a liquid-liquid solution.
o Let two volatile components of a binary solution be expressed as 1 and 2.
o In a closed vessel both the components of the solution would evaporate and establish an equilibrium state between the vapour phase and the liquid phase.