According to the temperature dependence of the solubility of 5- (2-nitrophenyl) -furan-2-carboxylic acid, 5- (3-nitrophenyl) -furan-2-carboxylic acid and 5- (4-nitrophenyl) -furan-2-carboxylic acid, in the values of enthalpy and entropy of their dissolution were calculated in ethyl acetate. Taking into account the enthalpy and entropy of melting listed up to 298K, the enthalpies and entropies of mixing are calculated. The dependence of the solubility of carboxyl-containing substances at 298 K on their melting point was established.
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