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Two pairs of conjugate solutions in the binodal area, not saturated with solid sodium nitrate, were determined by direct and complete analysis of the equilibrium phases formed from known mixtures of the three components (complexes 11 and 12 of Table I). The two tie-lines so obtained are sufficient to indicate that the plait point of the binodal curve must lie considerably over toward the dioxane-rich side. Two other points on the binodal curve (numbers 10 and 13 of Table I)were determined synthetically by a kind of titration: addition of solid sodium nitrate, in successive small portions, with shaking, to known weights of suitable mixtures of water and dioxane. The

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