The binary system citric acid-water has been investigated with static vapour pressure measurements, adiabatic calorimetry, solution calorimetry, solubility measurements and powder X-ray measurements.

It is shown that the derivation of the possible types of phase-equilibrium diagrams can be performed in an elegant manner with the help of the equal-G curve. Such a derivation is worked out, within the model of regular solutions, for the isobaric binary equilibrium between solid and liquid solutions. Attention is paid to the relation to the original derivation of Bukhuis Roozeboom and a remark is made about the obstacles encountered in the thermodynamical interpretation of phase diagrams. The thermodynamic excess functions are presented in the form of a series of sine terms.

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