首页> 外文期刊>Journal of Solution Chemistry >A Raman Spectrographic and Potentiometric Study of Aqueous Lithium and Potassium Acetate Complexation at Temperatures from 20 to 200 ∘C
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A Raman Spectrographic and Potentiometric Study of Aqueous Lithium and Potassium Acetate Complexation at Temperatures from 20 to 200 ∘C

机译:醋酸锂和醋酸钾水溶液在20至200 CC温度下的拉曼光谱和电位分析

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摘要

The Raman spectra of aqueous NaOH–CH3COOH solution containing either LiCl or KCl were collected at temperatures from 20 to 200 ∘C. Interpretation of these spectra reveals significant aqueous LiCH3COO0 formation, but no evidence of aqueous KCH3COO0 formation. LiCH3COO0 dissociation constants generated from these data decrease with the increasing temperature from −0.25 at 20 ∘C to −1.08 at 200 ∘C. Potentiometric measurements were performed on similar solutions at temperatures from 25 to 90 ∘C. These results are in general agreement with the Raman spectral results. Significant aqueous Li-acetate complexing is observed; aqueous K-acetate complexing is far weaker than that of Li-acetate. Dissociation constants for aqueous LiCH3COO0 generated from the potentiometric measurements decrease from −0.20 at 25 ∘C to −0.62 at 90 ∘C, whereas those for aqueous KCH3COO0 decrease from ≳ 0.35 to −0.02 over this temperature range.
机译:含有LiCl或KCl的NaOH–CH3 COOH水溶液的拉曼光谱是在20至200 CC的温度下收集的。这些光谱的解释显示出明显的含水LiCH3 COO0 形成,但是没有证据表明有含水KCH3 COO0 形成。这些数据生成的LiCH3 COO0 离解常数随着温度的升高而从20℃时的-0.25降低到200℃时的-1.08。在相似的溶液中,在25至90℃的温度下进行电位测量。这些结果与拉曼光谱结果基本一致。观察到明显的锂乙酸盐水溶液络合。乙酸钾水溶液的络合作用远弱于乙酸锂。电位测量法产生的LiCH3 COO0 水溶液的离解常数从25 CC时的-0.20降低到90 CC时的-0.62,而KCH3水溶液的解离常数从25 CC降低至-0.62。在此温度范围内,sub> COO0 从≳0.35降至-0.02。

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