Acta Chimica Sinica ›› 1963, Vol. 29 ›› Issue (4): 277-283.

### 在盐的水溶液中非电解质的活度系数的研究——Ⅴ.无机盐对于邻硝基苯甲酸在水中溶度的影响

1. 北京大学化学系
• 投稿日期:1963-02-09 发布日期:2013-06-03

### STUDIES OF ACTIVITY COEFFICIENTS OF NONELECTROLYTES IN AQUEOUS SALT SOLUTIONS——Ⅴ. THE EFFECTS OF SALTS ON THE SOLUBILITIES OF σ-NITROBENZOIC ACID IN WATER

YANG TAN, KWAN HUN-MEI, LIU JUI-LING, HUANG TZU-CHING

1. Department of Chemistry, Peking University
• Received:1963-02-09 Published:2013-06-03

The solubilities of o-nitrobenzoic acid in aqueous solutions of NaCl, KCl, LiBr, NaBr, KBr, KNO3, KSCN, NaClO4 and (CH3)aNBr were determined at 25℃.Following Randall and Failey, some assumptions about the activity coefficients of the ions of o-nitrobenzoic acid in salt solutions were made and thereby it was possible to calculate the activity coefficients of its undissociated molecules in these solutions.In the range of salt concentrations C, studied (the least being 0 to 0.5 n, the largest being 0 to 1.5 n), the plots of log fu vs.Cs are all straight lines.Comparison of their slopes yields the salting-out order of the undissociated part of the o-nitrobenzoic acid as follows:NaCl>LiBr>NaBr>KCl>KBr>KNO3>NaClO4>KSCN>(CH3)4NBr,in which the order between potassium nitrate and sodium perchlorate is correct, only when our assumptions about the activity coefficients are correct.