Unformatted text preview: (d) CuS, PbS, and SnS (e) CoS, CuS, FeS, PbS, and SnS A student was handed a test tube containing the following 12 cations in solution: Ag + , Pb 2+ , Bi 3+ , Cu 2+ , Sb 5+ , Sn 4+ , Fe 3+ , Al 3+ , Cr 3+ , Ni 2+ , Co 2+ , and Zn 2+ and performed the following analysis: 1. Cold, dilute HCl was added to the solution in the test tube forming a white precipitate and a clear decantate. The decantate was transferred to a clean dry test tube to be analyzed in step 2. 2. The decantate obtained in step 1 was treated with HNO 3 and H 2 S forming a dark precipitate and a colorless solution. The student again centrifuged and dumped the colorless decantate in a clean dry test tube for further analysis in step 3. 3. The solution obtained in step 2 was treated with NH 3 and NH 4 Cl forming a dark precipitate and a colored solution....
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- Spring '06
- Chemistry, Test Tube, Hydrogen sulfide, FeS