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exp11-12 - Qualitative Analysis Lab#11-12 Purpose The...

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Qualitative Analysis Lab #11-12 Purpose The purpose of this lab was to test for cations in a mixture of inorganic salts. When a cation was identified through one of the various tests, it was marked as being present. The cations could have been any of the following: Ag + , Ba 2+ , Ca 2+ , Cu 2+ , Fe 3+ , Mn 2+ , NH 4 + , Ni 2+ , or Pb 2+ . The tests were used to determine which cations were present in Unknown 3. Experimental Methods For detailed information on what tests to perform and when to perform them, refer to the completed flowcharts on pages 2 and 4. For information on how to perform each individual test refer to the lab instructions for Lab # 11-12. Data and Observations The following are notes and observations about each test: G-1 Test It was difficult to completely decant without getting a little bit of the precipitate in the solution. L-1 Test Lead was separated out of both known and unknown samples. A clear liquid and white precipitate was left over in the other test tubes. When K 2 CrO 4 was added, lead was confirmed in the known and unknown samples. S-1 Test The known sample turned white after adding HNO 3 . The unknown didn’t turn white. Silver is therefore not present in the unknown sample. Silver is present in the known sample. G-2 Test The clearish yellow liquid of the known and unknown turned milky yellow and pale with the addition of thioacetamide. Both were put into a hot water bath for 10 minutes where by the end both samples turned black. Both test tubes had a horrible smell.
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