LIQUID-VAPOR-EQUILIBRIUM OF AQUEOUS SODIUM-CHLORIDE, FROM 298 TO 373K AND FROM 1 TO 6 MOL KG-1, AND RELATED PROPERTIES
LIQUID-VAPOR-EQUILIBRIUM OF AQUEOUS SODIUM-CHLORIDE, FROM 298 TO 373K AND FROM 1 TO 6 MOL KG-1, AND RELATED PROPERTIES
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DOI：
10.1021/je60062a023
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发表时间：
1974-01-01
期刊：
影响因子：
--
通讯作者：
CREEK, JL
中科院分区：
文献类型：
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作者：
GIBBARD, HF;SCATCHAR.G;CREEK, JL
1.0-6.1 mol kg™ 1 氯化钠水溶液的蒸气压在 298 至 373K 范围内测量。改进了蒸汽压测量装置，提高了便利性和精度，可以由一个观察者操作；测量精度为±0.002K或±0.005torr，以较大者为准。根据这些测量值、其他蒸气压和冰点测量值以及 298K 下的量热焓和热容量，确定了氯化钠水溶液的改进德拜-休克尔幂级数摩尔浓度方程的 20 个参数。该方程与蒸汽压、浓差电池电动势和热性能的测量结果进行了比较。一致性通常非常好。之前的液汽平衡静态测量 (33-35) 表明该方法具有更高的精度。因此，我们重建了细胞和大部分辅助装置（9、10）。普遍感兴趣的变化是将膜零压力计替换为液汞压力计，以及将空气恒温器替换为油恒温器。测量的量是平衡温度和压力、各组分的总量以及气相的体积。
Vapor pressures of 1.0-6.1 mol kg™ 1 aqueous sodium chloride were measured from 298 to 373K. The apparatus for measuring vapor pressures was modified to increase the convenience and the precision so that it could be operated by a single observer; the precision of measurement was±0.002 K or±0.005 torr, whichever was larger. From these measurements, other vaporpressure and freezing-point measurements, and calorimetric enthalpies and heatcapacities at 298K, 20 parameters of the modifiedDebye-Huckel-powerseries-in-the-molality equation were determined for aqueous sodium chloride. The equation was compared with measurements of the vapor pressure, the electromotive force of concentration cells, and thermal properties. The agreement was usually excellent.Previous static measurements of liquid-vapor equilibri-um (33-35) indicated that the method is capable of even greater precision. Therefore, we reconstructed the cell and most of the auxiliary apparatus (9, 10). The changes which are of general interest were the replacement ofthe membrane null manometer by a liquid mercury manome-ter and the replacement of the air thermostat by an oil thermostat. The quantities to be measured were the equilibrium temperature and pressure, the total amount of each component, and the volume of the vapor phase.