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ERIC Number: EJ825818
Record Type: Journal
Publication Date: 2008-Mar
Pages: 3
Abstractor: As Provided
Reference Count: 19
ISSN: ISSN-0021-9584
Alternative pH-Shift Ion-Exchange Chromatography: Quantitative Spectroscopic Monitoring of the Progress of a Reaction
Lopez, Concepcion; Martinez, Manuel; Rocamora, Merce; Rodriguez, Laura
Journal of Chemical Education, v85 n3 p426-428 Mar 2008
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.)
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:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A