关键词: 水, 钾离子, 平衡常数, 焓, 钡离子, 配位反应, 冠醚, 可逆反应, 热静力学

A new thermostatic method which can be adapted to those reversible reaction systems with the equilibrium constants from 1-104 is established. As an example, the coordination reactions of 18-crown-6 with K+ and Ba2+ are investigated in aqueous solution by this method, and their equilibrium constants and enthalpies thus obtained are in good agreement with the literature values.u

Key words: WATER, POTASSIUM ION, EQUILIBRIUM CONSTANT, ENTHALPY, BARIUM ION, COORDINATION REACTION, CROWN ETHER, RECIPROCAL REACTION