Solute species and equilibria in concentrated zinc chloride/hydrochloric acid solutions |
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| Affiliation: | 1. Department of Chemistry, Faculty of Science, Arak University, Arak 38156-8-8349, Iran;2. Institute of Nanosciences & Nanotechnology, Arak University, Arak, Iran;1. Department of Materials Science and Engineering, School of Engineering, Shiraz University, Zand Boulevard, Shiraz 7134851154, Iran;2. Department of Energy Science, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon 440-746, Republic of Korea;3. Department of Nano Science and Technology, Graduate School of Convergence Science and Technology, Seoul National University, Suwon 443-270, Republic of Korea;4. Department of Chemistry, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-747, Republic of Korea;5. Department of Energy Systems Engineering, Daegu Gyeongbuk Institute of Science & Technology, Daegu 711-873, Republic of Korea;1. Université Paris-Est, Laboratoire Géomatériaux et Environnement (EA 4508), UPEM, 77454 Marne-la-Vallée, France;2. Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, UMR 7154, CNRS, F-75005 Paris, France;3. IHE Delft Institute for Water Education, P.O. Box 3015, 2601 DA Delft, The Netherlands |
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| Abstract: | Examination of a series of concentrated ZnCl2HClH2O solutions with chloride/zinc stoichiometries ranging from 2:1 to 6:1 and with the mole fraction of Zn2+ being 0·015 in each solution have been examined by X-ray diffraction. The mean coordination of Zn2+ in each solution is pseudotetrahedral with the ZnCl and ZnO contact distances being 2·30 and 2·05 Å, respectively. The average number of chlorides tightly bonded to Zn2+ is, as expected, significantly related to the chloride/zinc and/or the chloride/water stoichiometries. The formation constant for tetrachlorozincate (II) in these solutions is ca. 80 M−2 if it is assumed that tetrachlorozincate(II) and/or dichlorodiaquozinc(II) are the principal species in each of these solutions. |
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