Solvent extraction equilibria of acids. VII. The co-extraction of water with strong mineral acids by trioctylphosphine oxide.
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概要
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The extraction of water from a 1 mol dm<SUP>−3</SUP> sodium perchlorate solution with trioctylphosphine oxide (TOPO) in four organic solvents and the co-extraction of water with hydrochloric, hydrobromic, hydroiodic, perchloric, nitric, and thiocyanic acids from 1 mol dm<SUP>−3</SUP> of the acid solution by TOPO in hexane have been studied at 25 °C. The extraction constants of water in the absence of any of the acids, <I>K</I>′<SUB>H<SUB>2</SUB>O</SUB>=[TOPO·H<SUB>2</SUB>O]<SUB>org</SUB>[TOPO]<SUB>org</SUB><SUP>−1</SUP>, were determined to be 10<SUP>0.40</SUP>, 10<SUP>0.00</SUP>, 10<SUP>−0.12</SUP>, and 10<SUP>−0.36</SUP> in benzene, hexane, carbon tetrachloride, and chloroform respectively. A discrepancy from the 1: 1 molar ratio of TOPO and water in the extract was observed in the higher-TOPO-concentration region in the hexane system. The co-extraction of water with the acids disolvated by TOPO was greater in the order of HCl\simeqHBr>HI>HClO<SUB>4</SUB>, and it was much poorer with the monosolvated acids, nitric and thiocyanic acid. The equilibria for these co-extractions of water with the acids are complicated.
- 公益社団法人 日本化学会の論文
著者
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Niitsu Masaru
Faculty Of Pharmaceutical Sciences Josai University
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Sekine Tatsuya
Departemnt of Chemistry, Science University of Tokyo
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Iritani Nobuhiko
Faculty of Pharmaceutical Sciences, Josai University
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