Co_Ni_Lab_Lec_2 - Co2/Ni2 Assay Week 2 Chem 223 Two Weeks Work Week I obtain sample Keep one part as mixture Pass another part through an

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Co 2+ /Ni 2+ Assay, Week 2 Chem 223
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Two Weeks Work Week I : obtain sample. Keep one part as mixture. Pass another part through an ion-exchange column to separate Co 2+ from Ni 2+ in preparation for determinations, Week 2. Week II : complex specimens. Measure absorbance for samples and standards.
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Sample Vol. Flask with 75 mL 12 M HCl Dilute to 100 mL Diluted mixed unknown Ni 2+ Standard Co 2+ Standard Diluted Ni 2+ Standard Diluted Co 2+ Standard Anion Exchange Chromatography Diluted Ni 2+ fraction Diluted Co 2+ fraction Week 1
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1. Collect to completion as shown by DMG or SCN test. 2. CoCl 4 2- fully forms only in 9 M Cl - . Completely dissociated in 4 M Cl - . 3. Must complete chromatography during first week!
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Quantitative View of CoCl 4 = Complex Bjerrum, A. S. Halonin, and L. H. Skibsted, "Studies on Cobalt(II) Halide Complex Formation. I. A Spectro- photometric Study of the Chloro Cobalt(II) Complexes in Strong Aqueous Chloride Solutions," Acta Chem. Scand. 29A,
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This note was uploaded on 01/06/2011 for the course CHEM 223 taught by Professor Scheeline during the Fall '08 term at University of Illinois at Urbana–Champaign.

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Co_Ni_Lab_Lec_2 - Co2/Ni2 Assay Week 2 Chem 223 Two Weeks Work Week I obtain sample Keep one part as mixture Pass another part through an

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