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 .