Ideal Solutions

To construct a phase diagram for a material, one needs the Gibbs free energy as a function of composition of the solution. There are various standard models for solutions that provide approximations to the Gibbs free energy.

Ideal solutions are the simplest case, they are a direct analogue of an ideal gas mixture. All solutions take on ideal behavior when they are dilute, this is called Raoult's law for the solvent and Henry's law for the solute.