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Densities and Apparent Molar Volumes of Aqueous Solutions of NaClO4, KClO4, and KCl at Temperatures from 293 to 343 K
Journal of Chemical & Engineering Data ( IF 2.6 ) Pub Date : 2021-08-25 , DOI: 10.1021/acs.jced.1c00495
Lubomir Hnedkovsky 1 , Glenn Hefter 1
Affiliation  

Densities of aqueous solutions of the strong electrolytes sodium perchlorate, potassium perchlorate, and potassium chloride have been measured by vibrating-tube densimetry at 5 K intervals over the temperature range 293.15 ≤ T (K) ≤ 343.15 up to near-saturation concentrations (for NaClO4 and KClO4) or to about 2 mol·kg–1 (for KCl) at 0.1 MPa pressure. Particular attention was paid to solute purity and solution composition. The densities were used to calculate the corresponding apparent molar volumes, Vϕ, which considerably extend and improve the quality of the volumetric database for these salts, especially with respect to temperature. Where comparisons were possible, the present Vϕ results agreed well with most literature data, with the significant exception of NaClO4(aq) at higher temperatures. The Vϕ values were extrapolated to infinite dilution using an extended Redlich–Rosenfeld–Meyer equation to yield the standard state partial molar volumes (V2o). A combination of these values with relevant literature data and a well-established extra-thermodynamic assumption was used to estimate the standard molar volumes, V2o(ion), of several key monovalent ions as functions of temperature. These values appear to be more reliable than existing estimates based on older data, and will be useful for determining volumes of other ions in aqueous solution.

中文翻译:

NaClO4、KClO4 和 KCl 水溶液在 293 至 343 K 温度下的密度和表观摩尔体积

在 293.15 ≤ T (K) ≤ 343.15 直至接近饱和浓度(对于 NaClO 4和 KClO 4 ) 或在 0.1 MPa 压力下达到约 2 mol·kg –1(对于 KCl)。特别注意溶质纯度和溶液组成。密度用于计算相应的表观摩尔体积V φ,这大大扩展并提高了这些盐的体积数据库的质量,尤其是在温度方面。在可能进行比较的情况下,目前的Vϕ结果与大多数文献数据一致,但在较高温度下的 NaClO 4 (aq)显着例外。使用扩展的 Redlich-Rosenfeld-Meyer 方程将V ϕ值外推到无限稀释,以产生标准状态部分摩尔体积 ( V 2 o )。将这些值与相关文献数据和完善的额外热力学假设相结合,用于估计标准摩尔体积V 2 o(离子),几个关键的单价离子作为温度的函数。这些值似乎比基于旧数据的现有估计值更可靠,并且可用于确定水溶液中其他离子的体积。
更新日期:2021-09-09
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