The standard potentials of the Pt, H2 (1 atm.) | HI, X% CH ¡OH | Agl-Ag cell have been determined in 0, 15, 30, 45, 60, 75, 99, and 100 wt. % methanol at 25°, 35°, and 45°C. over a hydrogen iodide concentration range of 0.005 to 0.1M. The activity coefficients of hydriodic acid at these mixed solvents have been calculated at 25°, 35°, and 45°C. and the standard free energies, enthalpies, and entropies of the cell have also been calculated. These thermodynamic functions give evidence of the structural changes occurring in the solutions as the percentages of methanol increases. The
Measurement of the conductance of uranyl chloride in the concentration range from 5 · 10~3 to 2 · 10~4 equivalents per liter at temperatures of 25.00, 35.00 and 45.00°C were made in pure water, and in mixtures of approximately 20, 40, 60, 80 and 97 weight per cent ethanol. The equivalent conductance at infinite dilution ( ") for each of the solvents at each temperature was obtained by graphical extrapolation of the data. The equilibrium constant (K) for the ion pair dissociation of the uranyl chloride in each solvent at each temperature was obtained from the same extrapolation of the data. In water solutions the conductance of the uranyl chloride was corrected for the conductance of the hydrogen ion at each concentration.The dependence of 0 and of upon temperature, viscosity, composition and dielectric constant are discussed.
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