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10 Nov 2019
CHE 169 Exp. # 4 Le Chatelier's Principle and Chemical Equilibrium Run each of the following reactions in test tubes. For each reaction record your observa write a net ionic equation. Interpret your observations in terms of chemical equilibrium. and 1. Label a test tube #1, and add a few mL of NaOH to it. 2. Add CaClh drop wise until a noticeable precipitate of Ca(OH)2 is present. 3. N Ca(OH)2 in it "4 Add 6M HCI (NOT 12M!!) drop wise to the first test tube (#1) with the Ca(OH)2 until a change is observed. Record your results. 5 Prepare a stock solution b cylinder adding H20 to bring the volume to 100 mL. Save this stock solution for the rest of the class 6. Take 5mL of the stock solution and note the color. Add about 1mL of 0.1M FeCla solution and observe the result. ow add a few drops of the phenolphthalein indicator to the test tube #1 with the y mixing 2mL of 0.1M FeCly and 0.1M KSCN in a 100 mL graduated 7. Take 5mL of the stock solution and note the color. Add about 1mL of 0.1M KSCN solution and observe the result. 8. Take 5mL of the stock solution and note the color. Add 0.1M AgNO, solution dropwise until n into two test tubes including the precipitate. 9. Add 2mL of 0.1M KSCN dropwise to one tube and observe the result. 10. Add 2mL of 0.1M FeCla dropwise to the second tube and observe the result 11. Add 2 drops of 6M HNO, to roughly 3mL of 0.1M K2 result. .12. Add 10% NaOH solution dropwise to the solution from step 11 until the original color is restored 11. Add 2 drops of 6M HNO, to roughly 3mL of 0. 1M K,CrO, solution and observe the 13. Add 2 drops of 6M H2SO, to roughly 3mL of 0.1M K Cro, solution and observe the result *14. Add 10% NaOH solution dropwise to the solution from step 13 until the original color is restored ed, 10% NaOH 15. Add 3 mL of conc. HCI dropwise to 2mL (no more) of 0.1M CoCl2 and observe the result. 16. Add water dropwise to the solution from step 15 until the reverse reaction is evident. 17. Take the test tube from step 16 and place it in a water bath on a Bunsen burner and heat. .18. Label a test tube #3, and then add a few mL of the Cua solution to it. 19. Add 6 M NaOH drop wise until a precipitate of Cu(OH)2 is observed. 20. Add 6M NH3 drop wise (Use Caution!! Are those goggles still on!) until a change is observed. You will probably need to stir or shake your test tube. Record your observations 21. Add 6M HCI dropwise until a change is observed. Stir or shake as you add the HCI Record all observations. Revision 1.00 17 Jan 2012
CHE 169 Exp. # 4 Le Chatelier's Principle and Chemical Equilibrium Run each of the following reactions in test tubes. For each reaction record your observa write a net ionic equation. Interpret your observations in terms of chemical equilibrium. and 1. Label a test tube #1, and add a few mL of NaOH to it. 2. Add CaClh drop wise until a noticeable precipitate of Ca(OH)2 is present. 3. N Ca(OH)2 in it "4 Add 6M HCI (NOT 12M!!) drop wise to the first test tube (#1) with the Ca(OH)2 until a change is observed. Record your results. 5 Prepare a stock solution b cylinder adding H20 to bring the volume to 100 mL. Save this stock solution for the rest of the class 6. Take 5mL of the stock solution and note the color. Add about 1mL of 0.1M FeCla solution and observe the result. ow add a few drops of the phenolphthalein indicator to the test tube #1 with the y mixing 2mL of 0.1M FeCly and 0.1M KSCN in a 100 mL graduated 7. Take 5mL of the stock solution and note the color. Add about 1mL of 0.1M KSCN solution and observe the result. 8. Take 5mL of the stock solution and note the color. Add 0.1M AgNO, solution dropwise until n into two test tubes including the precipitate. 9. Add 2mL of 0.1M KSCN dropwise to one tube and observe the result. 10. Add 2mL of 0.1M FeCla dropwise to the second tube and observe the result 11. Add 2 drops of 6M HNO, to roughly 3mL of 0.1M K2 result. .12. Add 10% NaOH solution dropwise to the solution from step 11 until the original color is restored 11. Add 2 drops of 6M HNO, to roughly 3mL of 0. 1M K,CrO, solution and observe the 13. Add 2 drops of 6M H2SO, to roughly 3mL of 0.1M K Cro, solution and observe the result *14. Add 10% NaOH solution dropwise to the solution from step 13 until the original color is restored ed, 10% NaOH 15. Add 3 mL of conc. HCI dropwise to 2mL (no more) of 0.1M CoCl2 and observe the result. 16. Add water dropwise to the solution from step 15 until the reverse reaction is evident. 17. Take the test tube from step 16 and place it in a water bath on a Bunsen burner and heat. .18. Label a test tube #3, and then add a few mL of the Cua solution to it. 19. Add 6 M NaOH drop wise until a precipitate of Cu(OH)2 is observed. 20. Add 6M NH3 drop wise (Use Caution!! Are those goggles still on!) until a change is observed. You will probably need to stir or shake your test tube. Record your observations 21. Add 6M HCI dropwise until a change is observed. Stir or shake as you add the HCI Record all observations. Revision 1.00 17 Jan 2012
Patrina SchowalterLv2
20 Jul 2019