Studies on the Viscosities, Conductances, and Adiabatic Compressibilities of Some Tetraalkylammonium Perchlorates in 2-Methoxyethanol

Abstract

Electrical conductances, relative viscosities, and apparent molal adiabatic compressibilities of solutions of some symmetrical tetraalkylammonium perchlorates in 2-methoxyethanol (ME) have been reported. The conductance data have been analyzed by the 1978 Fuoss conductance equation and the viscosity data by the Jones–Dole equation for associated electrolytes. The ionic contribution to the limiting equivalent conductance, viscosity B coefficient and other thermodynamic parameters have been determined using the “reference electrolyte” method. The viscosity data show that the tetraalkylammonium ions are poorly solvated and behave as structure-breakers in 2-methoxyethanol. Analysis of the conductance as well as the compressibility data reveals the existence of strong ion-ion interactions in this solvent medium. The compressibility data also indicate the electrostriction of solvent molecules around the tetraethylammonium ion, while for the larger tetraalkylammonium ions they are accommodated inside the space between the coiled alkyl chains attached to the nitrogen atom.

Effect of Solvent Composition on the Critical Micelle Concentration of Cetylpyridinium Chloride in Ethanol-Water Mixed Solvent Media

“…The measurements were made at room temperature (303.15K). The details of the experimental procedure have been described earlier (Das & Hazra 1992, Das & Hazra 1995. In order to avoid moisture pickup, all solutions were prepared in a dehumidified room with utmost care.…”

Determination of the average molecular weight of sodium polystyrenesulphonate from viscosity measurement

“…The values for these two cases (~ 1×10 -1 and ~ 5×10 -1 N NaCl) agree very well with those obtained from equation (2) and á = 0.88 at 308.15K which were taken from 13 . From figure 3, the intercept gives intrinsic viscosity which is =29.8 cm 3 .gm -1 = 2.98 dl.gm -1 and is obtained from the graph between reduced viscosity versus polymer concentration represent in Table 2. By putting the known values, in equation (1), the average molecular weight of polystyrenesulphonate was found to be, M v = 70186.15.…”

“…The measurements were made in a thermostat maintained within 0.05 0 C of the desired temperature by means of a mercury-in-glass thermoregulator, and the absolute temperature was determined by a calibrated platinum resistance thermometer and Muller bridge 3,4 . Several independent solutions were prepared, and runs were performed to ensure the reproducibility of the results.…”

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

“…The measurements were made at room temperature. The details of the experimental procedure have been described earlier [12,13]. Several independent solutions were prepared and runs were performed to ensure the reproducibility of the results.…”