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| Autor/inn/en | Lopez, Concepcion; Martinez, Manuel; Rocamora, Merce; Rodriguez, Laura |
|---|---|
| Titel | Alternative pH-Shift Ion-Exchange Chromatography: Quantitative Spectroscopic Monitoring of the Progress of a Reaction |
| Quelle | In: Journal of Chemical Education, 85 (2008) 3, S.426-428 (3 Seiten)Infoseite zur Zeitschrift
PDF als Volltext |
| Sprache | englisch |
| Dokumenttyp | gedruckt; online; Zeitschriftenaufsatz |
| ISSN | 0021-9584 |
| Schlagwörter | Undergraduate Students; Inorganic Chemistry; College Science; Science Instruction; Science Experiments; Molecular Structure; Spectroscopy; Laboratory Experiments |
| Abstract | The experiment described here for advanced inorganic chemistry undergraduate students includes a solvolysis reaction of [CoCl(NH[subscript 3])[subscript 5]][superscript 2+] in nonaqueous (H[subscript 3]PO[subscript 4]) medium, followed by an alternative way of using ion-exchange chromatography based on the capability of changing the charges of the species by a pH-shift ([Co(H[subscript 2]PO[subscript 4])(NH[subscript 3])[subscript 5]][superscript 2+]/[Co(PO[subscript 4])(NH[subscript 3])[subscript 5]]). The complex is then hydrolyzed in acidic medium to produce the corresponding aquocomplex ([Co(H[subscript 2]O)(NH[subscript 3])[subscript 5]][superscript 3+]). Time monitoring of the latter process with UV-vis and [to the thirty-first power]P NMR spectroscopies is conducted and comparison of the two techniques indicate the validity of the results obtained despite the different spectroscopic response to the reaction mixtures. (Contains 1 scheme, 1 table and 1 figure.) (As Provided). |
| Anmerkungen | Division of Chemical Education of the American Chemical Society. Subscription Department, P.O. Box 1267, Bellmawr, NJ 08099-1267. Tel: 800-691-9846; Tel: 856-931-5825; Fax: 856-931-4115; e-mail: jchemed@egpp.com; Web site: http://www.jce.divched.org |
| Erfasst von | ERIC (Education Resources Information Center), Washington, DC |
| Update | 2017/4/10 |
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