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This investigation of the solubilities of the isomeric nitro benzoic acids in various liquids was undertaken with the purpose of acquiring data which could be used for systematic correlations. It was hoped that comparison of these data with those obtained by the authors for the nitranilines* 1 and the amino benzoic acids,2 would permit generalizations which could be applied to various systems of this same type. The selection of the nitro benzoic acids was made primarily to complete the data for all the possible di-substituted benzene derivatives which contain the nitro, amino, and carboxyl groups.Solubility data for these isomeric nitro acids are quite meager. Measurements for these acids have been secured for various temperatures in benzene, heptane and water.3 Determinations at isolated temperatures may also be found for various solvents.

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