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Report-Experiment 2-CHM-120.docx

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University of Toronto Mississauga
Judith C Poe

P a g e | 1 Purpose: The purpose of the experiment was to identify the ions present in a given unknown solution by performing some standard tests for qualitative detection of some common cations in aqueous solution. The main objective of the experiment was to isolate lead, aluminum, copper and iron ions by precipitating them as insoluble salts and use specific tests to confirm their presence in the known(control) and unknown solution by repeating the procedure for both of them. Experimental Method:  Refer to the Lab Manual 1 o No Deviations were taken from the lab manual Collection of Data The experimental observations were recorded on the data sheet attached at the end of the report. Experimental Results The observations for the control and the unknown solution were compared and appropriate conclusions were drawn. Table-1 Experimental results of the control and the unknown solution Observations Test Known Unknown Conclusions on Unknown 1. 2.5 mL of unknown # 2 and 0.2 mL of White White Indicates the presence 6M HCl. Stir well, centrifuge. Add 1 2+ +2 drop of 6M HCl to decant the solution Precipitate Precipitate of Pb ions Pb ions are present 2. Precipitate from①, add 2.5 mL H O 2 Yellow Yellow Confirms the presence heat add 3 drops 1M K 2rO 4 Precipitate Precipitate of Pb ions 3. Decanted solution from ① + 0.5mL of Black Black Indicates presence of 1M thioacetamide + Heat. Stir well and 2+ 2+ centrifuge. Decant the clear solution Precipitate Precipitate Cu and Pb ions +2 Cu ions are 4. Precipitate from ③, add 0.5mL H O 2 White White present and 0.5mL of 6M HNO . 3eat the test- Confirms the presence tube Precipitate Precipitate of Cu ions 5. Cool solution from ④, add drops 6M Deep Blue Deep Blue P a g e | 2 NH until the solution is basic to litmus solution solution 3 paper. 6. Add 6M acetic acid to solution from⑤ Red-Brown Red-Brown till color fades + acidic to litmus paper. Precipitate Precipitate Add 2 drops of 0.1M K Fe4CN) . 6 7. Clear solution from ③ + 0.2mL of 6M HCl. Stir well and centrifuge. Decant the solution and add 3% H O f2l2owed by Red Red Indicates the presence drops of NaOH till litmus is blue. Add a Precipitate Precipitate of Fe ions few more drops of NaOH, boil for 3 3+ minutes, centrifuge. Decant the clear Fe ions are present solution 8. Precipitate from ⑦, add 0.5mL H O 2 and 0.5mL H SO . Stir well, centrifuge. Deep-Red Deep-Red Confirms the presence 2 4 3+ Half the volume of solution and add 2 Solution Solution of Fe ions drops of 0.1M KSCN (aq) 9. Clear solution from ⑦ + HNO until 3 solution is acidic. Stir well and then reduce solution from 2mL to 1.5mL by Gelatinous Gelatinous Indicates the presence Precipitate Precipitate of Al ions boiling. Add 6M NH 3(aq)drops until solution is basic. 10. Centrifuge solution from ⑨ and Al ions are separate precipitate. Dissolve precipitate in 0.5mL of 6M HNO . Pink Solution Pink present 3(aq) Solution Add 0.5 mL H O 2 1 drop Aluminon Confirms the presence reagent. Stir well of Al ions 11. Pink solution from ⑩ + 6M NH 3(aq) Faint Blue Faint Blue drops until basic to litmus. Centrifuge ring in the ring in the the solution middle middle Discussion and Conclusion* During the experiment, different separation techniques were employed in order to isolate four different ions through precipitation. Following the separation, the precipitate was mixed with several other chemicals to confirm their identity. 2+ The first separation technique was to confirm the presence of Lead ions (Pb ). This was achieved by treating both the known and unknown solution wit
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