Solubility diagram of two partially miscible liquids

Principle

A number of different mixtures of phenol and water are prepared and heated until complete miscibility is achieved. As the mixtures cool, two-phase systems form at certain temperatures which are recognisable by the appearance of turbidity. Plotting separation temperatures against compositions of the mixtures gives the separation curve.

Benefits

• Good and reproducible results due to temperature control in the experiment.

Tasks

1. Plot the separation curve of the phenol / water binary system and prepare a temperature / mass fraction diagram.
2. Determine the critical separation point.
   

What you can learn about

• Binary system
• Miscibility gap
• Mixed phase
• Coexisting phase
• Raoult's law
• Critical dissolution temperature

Necessary accessories

• Precision balance 620g/0.001g