Unknown: To isolate the sulfide from the solution was a bit more complex since Bi2S3was acompound that was left to be separated in the end. In this case, Sulfide was the final left overresidue after separating all the other cations. We confirmed the presence of the sulfide ion byidentifying the residue to have a yellowish color. B. Confirming Tin.Known: In this experiment, tin is identified as substance with a yellowish-orange color. Afterobtaining the black precipitate from part A, some aggregations were performed to obtain aprecipitate. This precipitate was separated from the supernatant liquid. The supernatant liquidwas then tested and heated. After heating it produced a compound that was yellowish-orangein color. This confirmed the presence of tin. Unknown: The presence of tin was observed in the unknown solution. The liquid turns toyellow after I add CH3CSNH2.C. Confirming Cadmium.
Known: We again start with the residue from part A. After performing the steps advised inthe procedure, we obtain a supernatant liquid. This liquid is mixed with 6M NH3to make itbasic. The basic mixture is then boiled, forming a yellow precipitate. This confirms the pres-ence of cadmium. Unknown: After following the same procedure as the known; we determine that the forma-tion of a yellow compound after heating indicates the presence of cadmium in the unknownas well. D. Confirming Bismuth and Copper. Known: The colors to identify the two elements are white and dark blue respectively. Afterperforming the desired actions, we obtain a mixture which is combined with 6M NH3tomake it basic. This mixture is then centrifuged and mixed with other chemicals to obtain twocomponents. One is a blue liquid and the other is a white precipitate. We separate the twocomponents using centrifusion and decanting. This gives us the blue liquid as the supernatantand the white precipitate as the leftover residue. This confirms the presence of both bismuth
You've reached the end of your free preview.
Want to read all 6 pages?
- Summer '15
- Chemistry, supernatant liquid, Alkacid