Solubility, protonation and activity coefficients of some aminobenzoic acids in NaClaq and (CH3)4NClaq, at different salt concentrations, at T= 298.15 K

化学 质子化 溶解度 离子强度 电位滴定法 稀释 邻氨基苯甲酸 活度系数 无机化学 盐(化学) 水溶液 离子 物理化学 有机化学 热力学 物理
作者
Clemente Bretti,Ottavia Giuffrè,Gabriele Lando,Silvio Sammartano
出处
期刊:Journal of Molecular Liquids [Elsevier BV]
卷期号:212: 825-832 被引量:16
标识
DOI:10.1016/j.molliq.2015.10.043
摘要

Protonation constants of 2-aminobenzoic acid, (anthranilic acid, vitamin L1) (1), 4-aminobenzoic acid (PABA) (2), and 2-aminoterephthalic acid (3) have been obtained from potentiometric measurements at 25 °C (298.15 K) and ionic strengths between 0 and 5 mol ⋅ dm− 3 NaCl and between 0 and 3 mol ⋅ dm− 3 (CH3)4NCl. Values for the step-wise protonation constants log K1 and log K2, extrapolated to zero ionic strength and infinite dilution, were determined as follows. For 2-aminobenzoic acid: 4.958 ± 0.003 (error estimate at the 95% confidence interval) and 2.060 ± 0.007; for 4-aminobenzoic acid: 4.868 ± 0.008 and 2.420 ± 0.004; for 2-aminoterephthalic acid: 5.089 ± 0.004 and 3.594 ± 0.006. Differences between protonation constants obtained using various concentrations of NaCl(aq) and (CH3)4NCl(aq) for ionic strength adjustment are interpreted in terms of formation of weak complexes between the ligands and the ions of the background electrolyte. Values of log K for the formation of 1:1 complexes of the aminobenzoate anion with the tetramethylammonium cation have been estimated. The dependence of the solubility was studied as a function of NaCl(aq) and (CH3)4NCl(aq) concentration. Similar behaviour was found for the three ligands. The total solubility increases with increasing NaCl(aq) concentration, whereas the opposite trend is observed in (CH3)4NCl(aq). Total and specific solubility was also determined, from which Setschenow coefficients and activity coefficients were deduced for the various species. Activity coefficient variation was examined in terms of both a Debye–Hückel type equation (DHt) and a SIT (Specific ion Interaction Theory) model.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
1秒前
AmbitionY完成签到,获得积分10
2秒前
小蘑菇应助晓晓采纳,获得10
3秒前
3秒前
flowerliu发布了新的文献求助10
3秒前
Akim应助大魔王采纳,获得10
4秒前
fwl完成签到 ,获得积分10
4秒前
4秒前
6秒前
Jasper应助稳重向南采纳,获得10
7秒前
科研白白发布了新的文献求助10
7秒前
9秒前
9秒前
白昭完成签到,获得积分10
9秒前
qsy完成签到,获得积分10
10秒前
骆骆完成签到,获得积分10
11秒前
Fran07发布了新的文献求助10
13秒前
慕青应助咎星采纳,获得10
13秒前
13秒前
miao发布了新的文献求助10
14秒前
坦率的含海完成签到,获得积分10
15秒前
16秒前
17秒前
上官若男应助稳重向南采纳,获得10
17秒前
lzx应助painx采纳,获得10
17秒前
17秒前
丁璐完成签到,获得积分10
18秒前
哈尼发布了新的文献求助50
19秒前
19秒前
紫轩完成签到,获得积分10
20秒前
大魔王发布了新的文献求助10
20秒前
Learning完成签到,获得积分20
20秒前
20秒前
结实的秋凌完成签到,获得积分20
22秒前
橙子发布了新的文献求助20
22秒前
23秒前
坨坨发布了新的文献求助10
23秒前
大个应助流念采纳,获得10
23秒前
量子星尘发布了新的文献求助10
24秒前
科研发布了新的文献求助10
24秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Picture Books with Same-sex Parented Families: Unintentional Censorship 500
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
A Preliminary Study on Correlation Between Independent Components of Facial Thermal Images and Subjective Assessment of Chronic Stress 500
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 360
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3971395
求助须知:如何正确求助?哪些是违规求助? 3516110
关于积分的说明 11180848
捐赠科研通 3251238
什么是DOI,文献DOI怎么找? 1795760
邀请新用户注册赠送积分活动 876012
科研通“疑难数据库(出版商)”最低求助积分说明 805228