전해질 용액에서 용매 및 이온의 활동도 계수

Activity coefficients of Solvents and Ions in Electrolyte Solutions

In this work we measured the total pressure of the aqueous solutions and the methanol-water solutions dissolved with inorganic salts, at 25℃. In organic electrolytes used in this work were K₂SO₄and (NH₄)₂SO₄. Using the measured vapour pressures the activity coefficient of solvents and the mean ionic activity coefficient were obtained through thermodynamic relations. The activity coefficients of solvent and the mean ionic activity coefficirnt obtained in this work were fitted with Macedo’s model and Acard’s model. Both two models were good agreeable to the vapor pressure and the mean ionic activity coefficient for the electroyte aqueous solutions. For electrolyte /methanol/water solutions, Macedo’s model had much deviation from experimental data, while Acard’s model showed a good agreement with experimental data.