Electrical Conductances of Tetrabutylammonium Bromide, Sodium Tetraphenylborate, and Sodium Bromide in Methanol (1) + Water (2) Mixtures at (298.15, 308.15, and 318.15) K

Abstract

The electrical conductances of the solutions of tetrabutylammonium bromide (Bu 4 NBr), sodium tetraphenylborate (NaBPh 4 ), and sodium bromide (NaBr) in methanol (1) + water (2) mixed solvent media containing 0.10, 0.20, and 0.30 volume fractions of methanol have been reported at (298.15, 308.15, and 318.15) K. The conductance data have been analyzed by the 1978 Fuoss conductance-concentration equation in terms of the limiting molar conductance (Λ 0 ), the association constant (K A ), and the association diameter (R). The ionic contributions to the limiting molar conductance have been estimated using tetrabutylammonium tetraphenylborate (Bu 4 NBPh 4 ) as the "reference electrolyte". All of these three electrolytes are found to exist as free ions in the present solvent mixtures within the temperature range (298.15 to 318.15) K. Besides the relative permittivity and the viscosity of the media, specific interactions of the ions with the solvent media have been found to play a profound influence on their mobilities. Although the association constants of the electrolytes do not vary significantly as a function of temperature, the limiting molar conductances of the electrolytes as well as the single-ion conductivity values increase appreciably with temperature.

Effects of concentration and solvent composition on the electrical conductivity of sodium bromide in pure water and ethanol-water mixed solvent media

“…The relative permittivity of the medium decreased at a given temperature with increasing in the ethanol content and this trend has also been seen in the conductivity study [18,19,20,21,22] of methanol content in water. The conductance decreases with increase of alcohol content for the studied ethanol-water mixed solvent system.…”

Physicochemical Properties of L-Alanine in Aqueous Silver Sulphate Solutions at (298.15, 308.15, and 318.15) K

“…The pycnometer was calibrated at the experimental temperatures with doubly distilled water [23] and purified methanol [24]. The pycnometer with the experimental liquid was equilibrated in a glass-walled thermostated water bath maintained at ±0.01 K of the desired temperature.…”

“…The viscosity (η) was measured by means of a suspended Ubbelohde type viscometer, calibrated at the experimental temperatures with doubly distilled water [23] and purified methanol [24]. A thoroughly cleaned and perfectly dried viscometer filled with the experimental solution was placed vertically in a glass-walled thermostat maintained to ±0.01 K. After attainment of thermal equilibrium, efflux times of flow were recorded with a digital stopwatch correct to ±0.01 s. At least three repetitions of each data point reproducible to ±0.02 s were taken to average the flow time.…”

A comparative study of Critical Micelle Concentration (CMC) and Free Energy of Micellization of cationic surfactant and anionic surfactant in different composition of methanol-water mixed solvent media by conductometric method at 308.15 K

“…Triply distilled water with a specific conductance less than 10 -6 S.cm -1 at 308.15 K was used for the preparation of the mixed solvents. The physical properties of methanol-water mixed solvents used in this study at 308.15 K are shown in Table 1 and those values are matched with the published works [21][22][23]. The relative permittivity of methanol-water mixtures at the experimental temperatures were obtained by regressing the relative permittivity data as function of solvent composition from the literature [24].…”