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Unformatted text preview: ated one of the three cations.
The results of the test will confirm presence or absence of that ion.
In Part A, you will run qualitative,
confirmatory tests on the individual ions to determine their behavior in the presence of iodide ions. In Part B, you
will run qualitative tests on the individual ions to determine their solubilities in the presence of HCl, hot water and
NH3. In Part C, you will use your results to develop a scheme to separate and identify the ions in a mixture
where all three ions are together. In Part D, you will use your scheme to separate and identify the cations in an
unknown mixture. Completion of all four parts of this lab during the allotted lab period is difficult for one student
pair. It is recommended that one student pair complete portions A and B; another student pair should complete
portions C and D. The student groups can then exchange observations. Equipment
6 small test tubes
1 test tube rack
1 test tube brush
3 glass stirring rods
1 250 mL beaker for waste collection
1 100 mL beaker for hot water bath with wire insert
1 pair of tongs
1 ceramic spot plate
1 hot plate
1 deionized water squirt bottle Reagents
0.1 M AgNO3
0.1 M Hg2(NO3)2
0.1 M Pb(NO3)2
3 M HCl
3 M NH3
0.2 M KI
www.webassig n.net/ebooks/wsug encheml1/lab_5/manual.html 2/6 4/15/13 Lab 5 - Qualitative Analysis unknown solutions Safety
HCl and NH3 are corrosive. They can attack the skin and cause permanent damage to the eyes. If either
solution splashes into your eyes, use the eyewash immediately. Hold your eyes open and flush with water. If
contact with skin or clothing occurs, flush the affected area with water. Have your lab partner notify your
instructor about the spill. The solutions also have irritating vapors. They should be used in a fume hood; avoid
inhaling the vapors.
Lead and mercury are toxic if ingested. You will be working with very small quantities of
these materials, so the hazard is minimal. Nonetheless, be aware of small splashes and spills. Cle...
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This document was uploaded on 01/22/2014.
- Spring '14