Laboratory Report for Experiment 15

Laboratory Report for Experiment 15 - Laboratory Report for...

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Laboratory Report for Experiment #15: Qualitative Analysis of Unknown Cations Kevin Ho Chemistry 106, Section 10, Elsa 10/08/11 Summary: In this lab we were given a solution that contained 2-4 unknown cations. We followed the flow chart and used our past observations and results from experiment #13 to identify the unknown cations. Results: My unknown solution #11 contained four cations. The solution contained Iron (III) (Fe 3+ ), Nickel (Ni 2+ ), Silver (Ag + ), and Manganese (Mn 2+ ). Discussion: My solution #11 was clear lime green; this indicates the presence of at least Fe 3+ and Ni 2+ . While performing the test, I was able to identify the presence of two more cations, Ni 2+ and Mn 2+ . In procedure 1, when 6M NaOH was added to the solution, no gas was produced within one minute. The litmus paper did not change and the solution in the evaporation dish turned black. This indicates that no NH 4 + was present in the solution, and the black solution shows that there are other cations present. A positive indication of NH 4 + would turn red litmus paper blue with the release of gas. In procedure 2, when 6M HCl was added to the solution, it created a white precipitate that settles at the bottom of the semi micro test tube. This test shows that there is Ag + and/or Pb 2+ present in the solution. However, it does not rule out the presence of Ni
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This note was uploaded on 01/16/2012 for the course CHEM 106 taught by Professor Bruce during the Fall '08 term at Washington State University .

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Laboratory Report for Experiment 15 - Laboratory Report for...

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