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In this investigation, the solid–liquid phase equilibrium and the mutual solubility for ternary 3-nitrophthalic acid–4-nitrophthalic acid–water system were determined at 283.15K and 333.15K. The phase diagrams of the system were constructed based on the measured solubility. The solid phases formed in the studied system were confirmed by Schreinemakers’ method of wet residues. In addition, the density...