Partially Miscible Liquids

A temperature-composition diagram is shown for two liquids (, ) that are only partially miscible within the region enclosed by the orange and pink curve. Each phase in the two-phase region contains both and ; the phase (represented by the pink line, mole fraction ) is enriched in and the phase (orange line, ) is enriched in . Outside the phase envelope, and are completely miscible. Sliders for temperature and overall mole fraction of move the black dot around the diagram. The sizes of the rectangles at the top for pure and pure are proportional to the overall mole fraction of that component. The sizes of the containers on the right are proportional to the amounts of the phases (either , , or a single miscible phase) in equilibrium, and the mole fractions are represented by the relative numbers of green () and blue () circles.

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