关于用朗格谬尔法测定蒸气压及计算活度的讨论

ON MEASUREMENT OF VAPOUR PRESSURE AND CALCULATION OF ACTIVITIES BY LANGMUIR METHOD

文中论述了用朗格谬尔法测定溶液中组元蒸气压计算活度的困难在于蒸气分子的平均摩尔质量和明格谬尔系数难于确定。作者从理论上论证了在恒温恒压下溶液中挥发组元蒸气分子的平均摩尔质量不随组成变化;应用朗格谬尔法直接测定组元的挥发速率和相应的朗格谬尔系数及克劳辛系数便可直接计算活度。

Measurement of vapour pressure of components in solutions and cal- culation of activities are difficult because the average molecular weight of vapour molecules and Langmuir coefficient are hard to be determined. The authors prove in theory that the average molecular weight of vola- tile component vapour molecules in solutions does not change with com- position at the constant temperature and pressure.The activity can directly be calculated by using Langmuir method to measure volatiliz- ...