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Laboratory Report for Experiment 17

Laboratory Report for Experiment 17 - Br I CO 3 2 and NO 3...

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Laboratory Report for Experiment #17: Qualitative Analysis of Unknown Salt Kevin Ho Chem106, Section 10, Elsa 10/25/11 Results: My unknown salt #11 was found to be NiSO 4. Discussion: To identify the cation in the salt I followed the procedures in the flow chart from experiment #13. In procedure 1, there is no formation of gas; this means that there is no NH 4 + present. In procedure 2, the solution does not form a precipitate, this rules out Ag + and Pb 2+ . In procedure 6, a green precipitate forms in the solution, this rules out the possibility of Al 3+ . In procedure 7, the precipitate from procedure 6 dissolved, this rules out Mn 2+ and Fe 3+ , leaving only Ni 2+ . In procedure 10, a pink precipitate forms to confirm the presence of Ni 2+ . To find the anion, I used the screening and confirmation test from experiment #14. In test II, there were no observable reactions. There was so litmus change, the solution remained clear/colorless, and the salt did not dissolve. These results rule out Cl
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Unformatted text preview: -, Br-, I-, CO 3 2-, and NO 3-. In test II, again there were no observable reactions. The solution remained clear/colorless, litmus did not change color, and no precipitate forms. This still leaves SO 4 2-and C 2 O 4 2-as the possible anion. In test IV the working solution forms a white precipitate in both the Barium and Calcium. This still supports both SO 4 2-and C 2 O 4 2-as the possible anion. In test V, there were no observable reactions after heating the solution. This shows that the anion is SO 4 2-, if it was C 2 O 4 2-then the solution would have turned pink then clear. In the confirmation of sulfate, a precipitate forms with barium chloride. This confirms a positive result for sulfate. While looking at the salt, I notice that each crystal is green cubic in shape. In the CRC Handbook, they describe the salt as yellow/cubic....
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