Lab 21 Qualitative Analysis Answers

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Pages: 7
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Name: Aliyah Dean
Lab Partner: Rosanna Bowles
Title: Lab 21 Qualitative Analysis
Date: April 11, 2017
Objective: The goal of lab 21 was to take an unknown solution and determine its ions.
Experiment Procedure
Part 1 Group 1
10 drops of the chosen unknown solution are added to a clean test tube. Four drops of 6 M HCl are also added to the unknown solution. The test tube with both unknown solutions and HCl is placed in a centrifuge for 1 minute. Afterwards testing of complete precipitation is required by adding only one drop of 6 M HCl to the supernate. Only if the supernate is turns cloudy to centrifuge the solution again until no more precipitate forms at all. After retrieving the maximum amount of precipitate, decant the solution from its …show more content…
Create a hot water bath and place the test tube in it while stirring for about one minute. Immediately centrifuge and decant the heated supernate into a fresh test tube. Repeat process a couple more times and combine to the supernate. Save the precipitate for the testing of Ag+ (if any). Finally add three drops of 1M K2CrO4 to the supernate. If a yellow precipitate forms then that confirms the presences of …show more content…
When mixing if a yellow precipitate forms then that means there is a presence of Ba2+ in the solution.to go further and confirm even more the presence of Ba2+ a flame test will be needed. Take the precipitate and dissolve it with 6M HCl and soak a small piece of magic eraser. While holding over the magic eraser of an open flame, if the flame turns a pale blue then again is another indication of Ba2+ in the solution,
Test for Ca2+ Take the supernate from the previous test a basic solution but adding dropwise 15M NH3. If any precipitate is formed in your solution, centrifuge and get rid of the precipitate that was in the test tube. Add .1M K2C2O4 and stir thoroughly. If solution makes a white precipitate then Ca2+ is in your solution. However, is no precipitate forms, take the solution and place it in a hot water bath. After the having solution in hot water bath, allow solution to cool and the check again for white precipitate. Furthermore, to confirm Ca2+ in the solution undergo the flame test. Same as confirming Ba2+ take the precipitate and dissolve it with 6M HCl and soak magic eraser. If the flame turns a Red-Orange color then the Ca2+ is
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