Sodium Salts of Benzoic, m-Salicylic, and p-Salicylic Acid: A Conductivity Study of Diluted Aqueous Solutions

Abstract

The electric conductivities of aqueous solutions of sodium salts of benzoic acid, m-salicylic acid, and p-salicylic acid were measured in the temperature range from T = (278.15 to 313.15) K and in the concentration range c = (≈2·10–4 to ≈5·10–3) mol·dm–3. The data were analyzed with Barthel's low-concentration chemical model yielding the limiting molar conductivity, Λ∞ (T), and the association constant, K A(T). Using the known data of the limiting conductivities of sodium ion the limiting conductivities of the anions were evaluated, and their hydrodynamic radii in water were estimated. From Λ∞(T) the Eyring activation enthalpy of charge transport was determined and found to be higher than the corresponding value for viscous flow of water. Practically the total dissociation of the investigated salts in water is evident, and considerable differences in the anion mobilities are observed. They are discussed in terms of diffusivity and permeability of related acids at different carrier systems.

Aggregation Behavior of Several Ionic Liquids in Molecular Solvents of Low Polarity—Indication of a Bimodal Distribution

“…2) The molar conductivities ( Figure 2) confirmt hat the studied concentration range is beyond the concentration region at whicha ne quilibrium exists mainly between freely dissolved ions and ion pairs. [20,24,43,44] 3) For solutions of [C 2 mim][NTf 2 ]i nC HCl 3 that displayed separate resonances for the ion-pair speciesa nd aggregate species, the H2 chemical shift was higher (more deshielding) for aggregate species than for the ion-pair species, whereas the reverse was true forH 4a nd H5. [25,26] The concentration dependencies of the H2 and H4 chemical shifts (Figure 8) are consistentw ith as hift from contact ion pairs to aggregate species with increasing IL concentrations.…”

Charging and aggregation of latex particles in aqueous solutions of ionic liquids: towards an extended Hofmeister series

“…The formation of ion pairs between cations and anions has been reported in various ILs. [53][54][55][56][57] The IL constituent ions adsorbed on the particle surface may also form ion pairs with the oppositely charged ions. The formation of such surface ion pairs will then influence the surface charge and also the CCC.…”

Ion mobility and clustering of sodium hydroxybenzoates in aqueous solutions: a molecular dynamics simulation study

“…A conductivity study on diluted aqueous solutions of o-HB, m-HB and p-HB 15 reveals that the mobility of the investigated anions is strongly dependent on the relative position of the a Faculty of Chemistry and Chemical Technology, University of Ljubljana, SI-1000 Ljubljana, Slovenia. E-mail: jure.gujt@fkkt.uni-lj.si b Chair of Theoretical Chemistry, Faculty of Chemistry, University of Duisburg-Essen, D-45141 Essen, Germany.…”

“…A conductivity study on diluted aqueous solutions of o-HB, m-HB and p-HB 15 reveals that the mobility of the investigated anions is strongly dependent on the relative position of the carboxylic and hydroxylic groups (Fig. 1).…”