Single-ion Setschenow coefficients for several hydrophobic non-electrolytes in aqueous electrolyte solutions

Abstract

. Setschenow coefficients have been derived from solubility measurements on cyclohexane, benzene, naphthalene, 1-naphthol, 1,5-dihydroxynaphthalene, and anthracene in alkali halide, tetraalkylammonium bromide, and tetraphenylarsonium chloride aqueous solutions at 298.2 K. Single ion Setschenow coefficients have thence been obtained by an assumption involving extrapolation of the tetraalkylammonium bromide results to zero cation volume. Setschenow coefficients for the tetraalkylammonium cations correlate well with a hydrophobicity parameter based on their transfer chemical potentials from water into 1,2-dichloroethane.

Temperature and sodium chloride effects on the solubility of anthracene in water

“…As observed in table 5, the Sechenov parameter, at around 298 K, estimated in this work agrees with the values reported by Perez-Tejeda et al [55], May et al [75], and Hefter et al [78]. The reported value also compares well with the value reported by Whitehouse [77], even though this value was estimated from solubility data of anthracene in seawater.…”

“…Uncertainty in k S was estimated as ±t (nÀ2) s b , where s b is the standard deviation of the slope and t (nÀ2) represents the value of the t of Student with (n À 2) degrees of freedom and a confidence level of 95%. Table 5 shows a comparison between Sechenov parameters at 298 K, determined in this work, and other values previously reported [55,62,[75][76][77][78].…”

“…Experimental determinations include studies at room temperature and atmospheric pressure [18,[45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60], at moderated temperature and atmospheric pressure [31,39,[61][62][63][64][65], and at high temperature or high pressure [66][67][68][69][70].…”

Receptacle Model of Salting-In by Tetramethylammonium Ions

“…Figure 9 (right panel) on the other hand suggests that, although the probability of finding a hydrophobic molecule in these voids is increased, the most probable location for a hydrophobe is in contact with the hydrophobic part of the alcohol molecule. This conclusion is consistent with the mechanism used to explain the experimental results9, 18, 19.…”

Protonation and Solvation Thermodynamics of Some Naphthol Derivatives in KCl Aqueous Solution of Different Ionic Strengths

“…The same trend for the change of the activity coefficients with the solution ionic strength was noted also for naphthalene-1,5diol, 4-amino-3-hydroxynaphthalene-1-sulphonic acid, and some oxygen-donor ligands [13,15,20]. The obtained average Setschenow coefficient value 0.21 ± 0.10 for the studied ligands is in good agreement with literature average = 0.20 ± 0.10 [23,24].…”