Q. 74.5( 2 Votes )

State Raoult’s la

Answer :

Raoult’s Law states that, ‘In a mixture of volatile liquids, the partial pressure of each component in the solution is the product of its vapour pressure at pure state and its mole fraction in the solution.’


Mathematically,



pi partial pressure of ith component


xi mole fraction of ith component


pi vapour pressure of pure component


For a binary solution containing volatile components, and according to Dalton’s law,





Ideal solution follows Raoult’s law, and should have following characteristics:


(i) Enthalpy of mixing should be zero,


(ii) Volume change of mixing should be zero,


(iii) The pressure variation within the solution should vary linearly with concentration.


The linear variation would be



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