It is the prime example of positive and negative deviations from Raoult's law.  
It is the prime example of positive and negative deviations from Raoult's law.  Full separation of toluene from water is accomplished through the use of Dean-Stark trap, which circumvents the problem presented by a mixture in this state.  Most often involving ethers, the Gibbs-Konovalov theorem describes its condition at the maximum and minimum of a vapor pressure curve, and states that, as long as pressure is constant, both the vapor and solution have the same composition while the mixture is in this state. FTP, identify the state in which two mixed liquids boil at constant composition, the bane of fractional distillation.
It is the prime example of positive and negative deviations from Raoult's law.  
azeotrope