Part B-Testing a Trial Unknown Directions: The trial unknown is randomly generated by the program. Be sure to upload the

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Part B Testing A Trial Unknown Directions The Trial Unknown Is Randomly Generated By The Program Be Sure To Upload The 1 (69.64 KiB) Viewed 11 times

Part B-Testing a Trial Unknown Directions: The trial unknown is randomly generated by the program. Be sure to upload the requirements for table 2 below. Isolating Group I cations (Ag, Hgr. Pb) from unknown Add 2 drops of the trial unknown to a test tube. Add 2 drops of 3M HCI. Centrifuge test tube. Decant supernatant into waste container. You should have a white precipitate left that contains Ag", Hg", & Pb². Isolating Pb² from Group I cation (Ag". Hg. Pb²") mixture Add 2 drops distilled water into leftover solid (precipitate). Heat test tube. Centrifuge test tube. Decant supernatant into a 2nd test tube. Allow the supernatant to stand. If a white precipitate reforms in the test tube containing the supernatant after standing, this means that Pb² is present. If a precipitate does not reform, this means that Pb²* is not present. Record your results. Discard the contents of this test tube into the waste container. Testing for the presence of Ag & Hg?" in the mixture Pb²+ is now eliminated from the list of possibilities. Let's test for the presence of Ag and Hg. Add 2 drops of ammonia (NH₂) to the precipitate left from the previous step. Centrifuge & decant the supernatant into a 2nd test tube. Add 2 drops of HCI to the precipitate. Add 2 drops of HCl to the supernatant. Add 2 drops of sodium chromate (Na-CrO4) to each test tube. Record your results. Determine whether Ag & Hg are present by comparing the final colors of the reaction in each test tube with the final colors produced in Part A. On the right-hand side of the screen, click 'Check Unknown'. Click on the buttons to indicate whether each cation is present or not, then click on Check Answer. Your results will be "graded". Insert a screenshot of your 'Check Unknown' page. This will serve as table 2. Table 2 (25 points): Screenshot of 'Check Unknown Page" Cations Present in Trial Unknown Part C-Testing an Assigned Unknown Directions: When you select 'Samples', in the dropdown menu, select assigned unknown. You may choose one of the following unknown samples: # 111, # 555, or # 999. Results for the assigned unknown will not be graded by the program. Please note that the assigned unknown may have one, two, or all three cations present. Using the procedure outlined for the trial unknown above in part B, choose an unknown sample and determine the cations present in the sample. Points for Table 3 will be based on the accuracy of your answers. Please insert your unknown number, and identified cations present in the sample below. Table 3 (25 points) Assigned Unknown # Cations Present in Assigned Unknown