Solubility of the Sodium and Ammonium Salts of Oxalic Acid in Water with Ammonium Sulfate

被引：7
|
作者：
Buttke, Lukas G. [1 ]
Schueller, Justin R. [1 ]
Pearson, Christian S. [1 ]
Beyer, Keith D. [1 ]
机构：
[1] Univ Wisconsin, Dept Chem & Biochem, La Crosse, WI 54601 USA
来源：
JOURNAL OF PHYSICAL CHEMISTRY A | 2016年 / 120卷 / 32期
基金：
美国国家科学基金会;
关键词：
CRYSTAL-STRUCTURE; OXALATE MONOHYDRATE; DICARBOXYLIC-ACIDS; AQUEOUS-SOLUTIONS; DUST PARTICLES; AEROSOLS; TEMPERATURE; DIFFRACTION; OXIDATION; CHLORIDE;
D O I：
10.1021/acs.jpca.6b05208
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The solubility of the sodium and ammonium salts of oxalic acid in water with ammonium sulfate present has been studied using differential scanning calorimetry, X-ray crystallography, and infrared spectroscopy. The crystals that form from aqueous mixtures of ammonium sulfate/sodium hydrogen oxalate were determined to be sodium hydrogen oxalate monohydrate under low ammonium sulfate conditions and ammonium hydrogen oxalate hemihydrate under high ammonium sulfate conditions. Crystals from aqueous mixtures of ammonium sulfate/sodium oxalate were determined to be ammonium oxalate monohydrate under moderate to high ammonium sulfate concentrations and sodium oxalate under low ammonium sulfateconcentrations. It was also found that ammonium sulfate enhances the solubility of the sodium oxalate salts (salting in effect) anddecreases the solubility of the ammonium oxalate salts (salting out effect). In addition, a partial phase diagram for the ammonium hydrogen oxalate/water system was determined.
引用
收藏
页码：6424 / 6433
页数：10
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