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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.

W. Craig Carter
2002-09-05