Miscibility gap in a ternary system



Principle

A number of completely miscible two component mixtures are prepared to investigate the three component acetic acid / chloroform / water system. These mixtures are titrated with the third component until a two phase system is formed which causes turbidity. The phase diagram for the three component system is plotted in a triangular diagram.

Benefits

• Good and reproducible results due to temperature control in the experiment.
• Stable and safe construction due to solid stand material

Tasks

1. Titrate nine different acetic acid / chloroform mixtures with water until a two phase system is formed in each case.
2. Titrate six acetic acid / water mixtures with chloroform until phase separation is observed.
3. Plot the results of the titrations, expressed as molar fractions, in a triangular diagram.

Learning objectives

• Three component system
• Miscibility gap
• Phase diagram
• Triangular diagram
• Gibb's phase law

Necessary accessories

• Chloroform
• Precision balance 620g/0.001g