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ERIC Number: EJ824969
Record Type: Journal
Publication Date: 2008-Feb
Pages: 3
Abstractor: As Provided
Reference Count: 21
ISSN: ISSN-0021-9584
Hydrolysis Studies and Quantitative Determination of Aluminum Ions Using [superscript 27]Al NMR: An Undergraduate Analytical Chemistry Experiment
Curtin, Maria A.; Ingalls, Laura R.; Campbell, Andrew; James-Pederson, Magdalena
Journal of Chemical Education, v85 n2 p291-293 Feb 2008
This article describes a novel experiment focused on metal ion hydrolysis and the equilibria related to metal ions in aqueous systems. Using [superscript 27]Al NMR, the students become familiar with NMR spectroscopy as a quantitative analytical tool for the determination of aluminum by preparing a standard calibration curve using standard aluminum solutions in dilute nitric acid keeping the aluminum in the hexaaquoaluminum ion form, Al(H[subscript 2]O)[subscript 6][superscript 3+]. The technique has a large linear dynamic range, and in this experiment it ranges from 10 to 1000 ppm. Once the quantitative technique is validated, the goal of the experiment is to investigate the hydrolysis of Al[superscript 3+] ions in aqueous solution by determining the concentration of the Al(H[subscript 2]O)[subscript 6][superscript 3+] ion by [superscript 27]Al NMR for a series of solutions with the same total concentration of aluminum but at various pHs ranging between 1.0 to 4.5. This experiment is also suitable for an instrumental analysis or inorganic chemistry course. (Contains 2 figures.)
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: Students; Teachers
Language: English
Sponsor: N/A
Authoring Institution: N/A