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  Home > JCE Print > Journal of Chemical Education > Issues > 2008  > March  >
In the Laboratory
Alternative pH-Shift Ion-Exchange Chromatography: Quantitative Spectroscopic Monitoring of the Progress of a Reaction
Concepción López, Manuel Martínez, Mercè Rocamora, and Laura Rodríguez
Departament de Química Inorgànica, Facultat de Química, Universitat de Barcelona, E-08028 Barcelona, Spain
Cover
March 2008
Vol. 85 No. 3
p. 426
Abstract
The experiment described here for advanced inorganic chemistry undergraduate students includes a solvolysis reaction of [CoCl(NH3)5]2+ in nonaqueous (H3PO4) 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(H2PO4)(NH3)5]2+/[Co(PO4)(NH3)5]). The complex is then hydrolyzed in acidic medium to produce the corresponding aquocomplex ([Co(H2O)(NH3)5]3+). Time monitoring of the latter process with UV–vis and 31P 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.
Supplement
Detailed preparative procedure for the students; Instructor notes; Spectral data
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Citation
López, Concepción; Martínez, Manuel; Rocamora, Mercè; Rodríguez, Laura. J. Chem. Educ. 2008, 85, 426.
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Keywords
Chromatography; Coordination Compounds; Hands-On Learning / Manipulatives; Inorganic Chemistry; Ion Exchange; Laboratory Instruction; NMR Spectroscopy; Second-Year Undergraduate; Upper-Division Undergraduate; UV-Vis Spectroscopy
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History
Created:
Last Updated:
2/4/2008
2/8/2008
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Experiments, laboratory exercises, lecture demonstrations, and other descriptions of the use of chemicals, apparatus, instruments, computers, and computer interfaces are presented in the Journal of Chemical Education as illustrative of new or improved ideas or concepts in chemistry instruction and are directed at qualified teachers. Although every effort is made to assure and encourage safe practices and safe use of chemicals, the Journal of Chemical Education cannot assume responsibility for uses made of its published materials. Many chemicals are hazardous. Precautions for the safe use of hazardous chemicals and directions for their proper disposal are described in the Material Safety Data Sheets and on the labels. We strongly urge all those planning to use materials from our pages to make choices and to develop procedures for laboratory and classroom safety in accordance with local needs and situations.
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