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Liquid-Vapor Phase Equilibrium

Liquid-Vapor Phase Equilibrium. Distillations will be performed in hood. Purpose. To study the equilibrium of a binary non-ideal liquid-vapor system. To construct a standard curve for refractive index vs composition To construct a phase diagram.

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Liquid-Vapor Phase Equilibrium

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  1. Liquid-Vapor Phase Equilibrium Distillations will be performed in hood

  2. Purpose • To study the equilibrium of a binary non-ideal liquid-vapor system. • To construct a standard curve for refractive index vs composition • To construct a phase diagram. • To determine the T and mol fraction of the azeotrope.

  3. Liquid-Vapor Equilibrium • An ideal solution obeys Raoult’s Law for all solution compositions. Water and 1-propanol are miscible but their solution does not obey Raoult’s Law. • The boiling point of a binary solution depends on the composition of the solution. See Chang Chapter 5.

  4. Experimental Procedure • Construct a standard curve for refractive index vs solution composition. You will use a refractometer to do this. • Carry out several distillations to find the boiling point of several equilibrium solutions. • Construct T vs mol fraction phase diagram and find the azeotrope characteristics for the water and 1-propanol system.

  5. Experimental Procedure • You will carry out 11 distillations and collect a liquid and a vapor fraction for each one. Good organization, clean glassware, careful lab technique and group communication are essential for success. • Assign duties to each group member before starting this experiment.

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