See attached Cation Lab. Thank you!


Question Description:

20.50

See attached Cation Lab. Thank you!,1. Conduct the following tests first on known solutions and then on the unknowns. Write net ionic equations for all reactions that produce a precipitate. 2. To properly record your test results, prepare a data table with the following headings: Cation Name T.T. 1 (HCl) NH3 T.T.2 (NaOH) Excess T.T. 3 (NH3) Excess T.T.4 confirmation 3. First test tube: a. Put 5 drops of the cation solution to be tested into a clean small test tube. b. Add about 5 pipet drops of hydrochloric acid, 6M HCl. Record the results. c. If a precipitate forms, i. Make the solution alkaline with aqueous ammonia, 6M NH3 (aq). The solution will turn pink litmus paper blue when the solution has been made basic. Stir and record your results. [Note: Litmus paper is an acid/base indicator. Red litmus paper will turn blue when it contacts a base and blue litmus paper will turn red when it contacts an acid.], and ii. Write a net ionic equation and go to test tube 4 for the confirmation test. d. If no precipitate forms with HCl go on to test tube 2. 4. Second test tube: Perform only if no precipitate formed in the first test tube. a. Put 5 drops of the cation solution into the second test tube. b. Add 1 drop of sodium hydroxide, 2M NaOH. Stir. Record your results. c. If a precipitate forms, i. Add 5 drops of sodium hydroxide (2M NaOH) and stir, ii. Observe whether the precipitate dissolves, and © Hands-On Labs, Inc. LabPaq CK-2 163 iii. Write a net ionic equation and go to test tube 4 for the confirmation test. d. If no precipitate formed or if the precipitate formed and dissolved with NaOH, go on to test tube 3. 5. Third test tube: Perform only if no precipitate formed or if the precipitate dissolved when excess NaOH was added in the second test tube. a. Put 10 drops of the cation solution into the third test tube. b. Add 1 – 2 drops of aqueous ammonia, 6M NH3 (aq). Stir. Record your results. c. If a precipitate forms: i. Add 5 drops of aqueous ammonia, 6M NH3 (aq) and stir, ii. Observe whether the precipitate formed dissolves, and iii. Write a net ionic reaction and go to test tube 4 for the confirmation test. d. If no precipitate forms go to test tube 4 for the confirmation test. 6. Fourth test tube: Per the following instructions and using a clean test tube, add 8 -10 drops of the appropriate cation for the confirmation test. Note: Where the following instructions call for “gently warming” a chemical, place the test tube containing the chemical into a 50-mL beaker of hot tap water for a few minutes. Al 3+: Mix 5 drops of 3 M ammonium acetate and 5 drops of aluminon reagent (aurin tricarboxylic acid). Then make the solution just alkaline with aqueous ammonia, 6 M NH3 (aq), and warm gently. (No equation required for this reaction.) NH4+: If you are testing an unknown salt solution perform this test first with a 1-mL sample of the unknown solution. Make the solution alkaline with sodium hydroxide (2M NaOH) and warm gently. Test for ammonia fumes by holding a piece of moist red litmus paper over the mouth of the test tube while the solution is being warmed. Do not let the litmus paper touch the test tube. In addition to the litmus paper test the odor of ammonia will provide further evidence if the solution is moderately concentrated. Ca2+: Add a few drops of ammonium oxalate solution (NH4)2C2O4. Cu 2+: Acidify with 1 drop hydrochloric acid (6M HCl) and add 1 drop of potassium hexacyanoferrate (II), K4Fe(CN)6. Fe3+: Add a few drops of potassium hexacyanoferrate (II). Pb2+: Add a few drops of potassium chromate (1M K2CrO4) while wearing gloves.. © Hands-On Labs, Inc. LabPaq CK-2 164 Ag+: Add hydrochloric acid until a precipitate forms. Dissolve the precipitate by adding aqueous ammonia. Then add nitric acid until the precipitate reappears. Zn2+: Add excess sodium hydroxide (2M NaOH) to the solution. Then add a few drops of sodium sulfide solution (0.2M Na2S). Unknown Solution: Obtain an unknown containing one of the cations studied. Carry out the tests in the first three test tubes as needed and use the information you gather to narrow the possibilities. Perform potentially appropriate confirmation tests until you identify,No, sorry. The attachment is the questions, the other are the procedures from the book for FYI only. Thanks.

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20.50