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The s-acetylthiocholine bromide, iodide and perchlorate were purified as reported in the literature [19], methanol (B.D.H) was purified previously as reported in refrence [20]. The specific conductance for purified methanol at different temperatures (25, 30, 35 and 40 °C) was found to be in the range (1.6 -7.3) x 10-7 Ω-1 cm-1. All solutions were reported by reducing weight to vacuo. Salts were weighed on microbalance which reads to ± 0.1 mg. Dilution was carried out successively into the cell by siphoning the solvent by means of weighing pipette. Conductivity Bridge was model Crison Cl P31 and the cell with bright platinum electrodes was used. The cell constant was 0.1 cm-1 for dilute solutions. The solvent constants used in all calculations were taken as reported [21-24], i.e., densities (d25°) = 0.78657 g . cm-3, (d30°) = 0.7862 g .cm-3, (d35°) = 0.7815 g . cm-3, (d40°) = 0.7765 g . cm-3, respectively, the viscosities (η25°) = 0.5448 x 10-2 P, (η30°) = 0.5030 x 10-2 P and (η35°) = 0.4620 x 10-2 P, (η40°) = 0.4220 x 10-2 P, respectively and the dielectric constants (D25°) = 32.63, (D30°) = 30.68, (D35°) = 29.90, (D40°) = 29.03, respectively.