Solubility of xenon in liquid n-alkanols: Thermodynamic functions in simple polar liquids

Measurements of the Ostwald solubility L(T) as a function of temperature in the range 10.0–50.0 °C are reported for 133Xe gas in 13 liquid normal alcohols: methanol through n-dodecanol, and n-tetradecanol. From the data for each solute–solvent system we find the mole fraction solubility x2(T), and calculate the following thermodynamic functions of solution: chemical potential Δμ○2(T) =−RT ln x2, enthalpy ΔH̄○2, and entropy ΔS̄○2, all based on the mole fraction scale. We also calculate directly from the Ostwald solubility the corresponding quantities based on the number density scale. These quantities are the chemical potential Δμ○ρ2(T) =−RT ln L, enthalpy ΔH○ρ2, and entropy ΔS○ρ2. The solute was chosen as an inert monatomic gas and the solvents were chosen in a polar homologous series in order to construct prototype solute–solvent systems. Solubility results and the associated thermodynamic functions are analyzed and compared with simple models.