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Lecture 7: Quasichemical Solution Models

The regular solution model assumes a random distribution of atoms even though the enthalpy of mixing is not zero. In reality, a random solution is only expected at very high temperatures when the entropy term overwhelms any tendency for ordering or clustering of atoms. It follows that the configurational entropy of mixing should vary with the temperature. The quasi–chemical solution model has a better treatment of configurational entropy which accounts for a non–random distribution of atoms. The model is so–called because it has a mass–action equation which is typical in chemical reaction theory