This simulation shows a solid-liquid phase diagram for two elements (A and B) that also form a solid compound (A₂B₃).  Mixtures of the pure solids (A + A₂B₃ and B + A₂B₃) are immiscible. The amounts of each phase (solid A, solid B, compound A₂B₃, and a liquid phase containing A and B) are shown in the bar graph on the right. The mole fraction of B in the liquid phase (mixture of A and B) is given above the liquid bar in the bar graph. Move the black point by adjusting the sliders for mole fraction B and heat added. When heat is added, the temperature increases, except when the point is on one of the two horizontal lines (at about 200^oC and 300^oC) or when pure A₂B₃ is in equilibrium with the liquid phase. On the lines at 200^oC and 300^oC, three phases can be in equilibrium: solid A₂B₃, liquid, and either solid A or B. The relative amounts of each phase are obtained by a mole balance. The amount of heat added is not meant to represent a real system. In the two-phase regions, the relative amounts of each phase are obtained using the lever rule, and the mole fraction of B in the liquid phase is shown by a vertical dashed line.

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About:

This simulation was made at the University of Colorado Boulder, Department of Chemical and Biological Engineering.  Author: Megan E. Maguire

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