Conductivity measurements of dilute aqueous LiOH, NaOH, and KOH solutions to high temperatures and pressures using a flow-through cell
Conductivity measurements of dilute aqueous LiOH, NaOH, and KOH solutions to high temperatures and pressures using a flow-through cell
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DOI：
10.1021/jp000845x
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发表时间：
2000-12-21
影响因子：
3.3
通讯作者：
Wood, RH
中科院分区：
文献类型：
--
作者：
Ho, PC;Palmer, DA;Wood, RH
在50 ~ 410 ℃和33 MPa的压力下，用流通式电导池测定了LiOH、NaOH和KOH稀水溶液（10（-5）~ 10（-3）mol kg（-1））的极限摩尔电导（λ（0））和摩尔离子缔合常数（KA（m））。流通池设计用于在高温和高压下以高精度测量稀电解质水溶液的摩尔电导。该结果与我们先前报道的用静态高压池测量的结果是互补的，静态高压池在浓度< 0.001 mol.kg（-1）和密度< 0.4 g.cm（-3）时不能产生可靠的测量结果。所有三种氢氧化物在密度（ρ）大于或等于g.cm-3）时的新λ（0）值与使用静态电池测得的值非常一致。然而，在密度低于0.5 g.cm（-3）时，新结果略高于可比条件下的先前结果，且分散程度较低。另一方面，所有三种氢氧化物的K-A（m）值与类似条件下的静态电池结果非常一致。
The limiting molar conductance (Lambda (0)) and molal ion association constant (K-A(m)) of dilute (10(-5) to 10(-3) mol kg(-1)) aqueous LiOH, NaOH, and KOH solutions were determined by a flow-through conductance cell from 50 to 410 degreesC and pressures up to 33 MPa. The flow-through cell is designed to measure molar conductances of dilute aqueous electrolytes with a high degree of accuracy at high temperatures and pressures. The results are complementary to our previously reported results measured with a static high-pressure cell, which was incapable of yielding reliable measurements at concentrations < 0.001 mol.kg(-1) and densities < 0.4 g.cm(-3). The new Lambda (0) values of all three hydroxides at densities (rho) greater than or equal to 0.5 g.cm(-3) are in good agreement with those measured using the static cell. However, at densities below 0.5 g.cm(-3) the new results are slightly higher and less scattered than the previous results at comparable conditions. On the other hand, the K-A(m) values of all three hydroxides are in excellent agreement with the static cell results under analogous conditions.