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在25℃下,作者测定了对硝基苯甲酸在氯化钠、氯化钾、溴化钠、溴化钾、高氯酸钠、氯化锶和氯化钡七个盐水溶液中的溶度。计算了该酸的未离解分子在不同盐浓度C_z(克分子/升)中的活度系数f_u。从logf_u对C_z的直线,得出七个盐对该酸未离解分子的盐析常数k,其次序是SrCl_2>BaCl_2>NaCl>NaBr>KCl>KBr>NaClO_4。我们还测定了邻硝基苯甲酸在25℃的氯化锂、氯化锶和氯化钡水溶液中的溶度,并算出该酸未离解分子的盐析常数,作为第Ⅴ报的补充数据。最后,我们比较了邻、间和对硝基苯甲酸的未离解分子在相同盐溶液中的盐析常数,并对这三种异构体的盐析常数不仅大小次序相同,而且数值也很接近的事实作了解释。
At 25 ° C, the authors determined the solubility of p-nitrobenzoic acid in seven brine solutions of sodium chloride, potassium chloride, sodium bromide, potassium bromide, sodium perchlorate, strontium chloride and barium chloride . The activity coefficient f_u of non-dissociated molecules of this acid at different salt concentrations C_z (mol / L) was calculated. From the line of logf_u to C_z, the salting-out constant k of the seven salts to the undissociated molecule of the acid is obtained. The order of the salt is: SrCl_2> BaCl_2> NaCl> NaBr> KCl> KBr> NaClO_4. We also measured the solubility of o-nitrobenzoic acid in aqueous solutions of lithium chloride, strontium chloride and barium chloride at 25 ° C and calculated the salting-out constants of the undissociated molecules of this acid as supplementary data for the report. Finally, we compared the salting-out constants of the undissociated molecules of o-, p- and p-nitrobenzoic acids in the same salt solution and found that the salting-out constants of the three isomers are not only in the same order of magnitude but also close in value The fact is explained.