Compound Identification or The James Bonding Mystery
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- Joseph Arnold
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1 Compound Identification or The James Bonding Mystery Purpose: To identify an unknown metal or nonmetal in an ionic compound by using flame and precipitate tests. Background Information: James Bonding is working on a case to determine which of his 3 spies (Larry, Moe, and Curly) are working for Dr. Evil. James Bonding has discovered that Dr. Evil is secretly working on developing an ionic solution that will take over the world. All three spies have been working on separate projects in James Bonding s crime lab. However, James suspects that one spy has been smuggling the same dangerous ionic solution out of the lab. Your job is to determine which spy s ionic solution matches the solution of Dr. Evil. First, you must record some results for known ionic compounds by using identification tests. Next, you will use these results to determine the identities of the spies solutions, and the identity of Dr. Evil s solution. Finally, you will identify which spy is aiding Dr. Evil in his ploy to take over the world. 007 Agent, good luck in your very dangerous mission. Mission 007 Terminology: Define the terms: Precipitate: Ionic Solution: Materials: Known ionic solutions (CuCl 2, LiCl, KBr, KI, NaF, NaBr), Bunsen burner, large paper clip (or inoculating loop), calcium nitrate, silver nitrate, spot plate, striker, goggles, unknown solutions (Dr. Evil, Larry, Moe and Curly).
2 Flame Test Procedure: 1. Straighten large paper clip and make a loop at one end (or use inoculating loop). 2. Put on goggles and light Bunsen burner with striker. 3. Dip loop one ionic solution and hold in flame. Record color of flame in table. 4. To completely rid loop of solution, dip loop into 6M HCl acid and then hold loop in flame until it glows RED. 5. Repeat steps 3 and 4 for the remaining ionic solutions. 6. Turn off the gas. Precipitate Test Procedure: 1. Clean out spot plate prior to beginning the precipitate tests. 2. Begin by placing 2 drops of calcium nitrate in 6 wells on your spot plate. 3. Next, add 3 drops of one ionic solution into one of the wells. Record the result of the reaction of your solution with calcium nitrate in the table. 4. Repeat step 3 for the remaining 5 ionic solutions. 5. Begin by placing 2 drops of silver nitrate in 6 wells on your spot plate. 6. Next, add 3 drops of one ionic solution into one of the wells. Record the result of the reaction of your solution with silver nitrate in the table. 7. Repeat step 6 for the remaining 5 ionic solutions. 8. Use the tests you think are necessary to determine the identity of the unknown solutions from Dr. Evil and the 3 spies. 9. Identify the unknown solutions by comparing your results with the results from the known solutions.
3 Flame Test Table: Ionic Solution Flame color Caused by which element? Ionic Solution Observations with Calcium Nitrate Precipitate Table: Caused by Observations which with Silver element? Nitrate Caused by which element?
4 Unknown Table: Create a table showing the results from the tests you used on each unknown solution. Analysis: Unknown Element Identified by Flame Test Element Identified by Precipitate Test Formula of Ionic Compound Conclusion Questions: 1. What was Dr. Evil s ionic solution? 2. Which spy was smuggling an ionic solution to assist Dr. Evil s plan? 3. What type of element can be identified using a flame test? Use an example from the flame test table to explain how you came to this conclusion.
5 4. How did you determine the non-metal in Dr. Evil s ionic solution? Discuss your comparison of the unknown solutions to the known ionic solutions in the table. 5. Name 2 solutions that were difficult to tell apart when using the flame or precipitate test. Explain why. 6. List some sources of error in your experiment. 7. If you were to repeat this experiment, what would you do to improve your results? Extension: Research Dr. Evil s ionic compound and create an evil plan explaining how this compound can be used to take over the world. Attach separate sheet.
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