Principle

A boiling point diagram shows the boiling points of a binary mixture as a function of the vapour / liquid equilibrium of the mixture at constant pressure. The boiling points of various mixtures of methanol and chloroform are measured and the composition of the liquid phases are determined using refractometry and a calibration curve.

Benefits


Important basic experiment for distillation

Excellent for the introduction of refractometry


Tasks


Determine the refractive indices of the pure components and about 10 different mixtures of known composition.

Plot the boiling point diagram of the binary mixtures of methanol and chloroform.


What you can learn about


Fundamentals of distillation

Equilibrium diagram

Chemical potential

Activity coefficient

Raoult’s law


 

Additional necessary


Chloroform