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(2p) Group II Refer to the Flow Chart for Group II to answer following questions. Treatment of an unknown solution with H2S and pH 0.5 produced a black-brown precipitate. The precipitate was treated with KOH. After centrifugation, the supernatant KOH solution was acidified with 6M HCl and treated with H2S. No precipitate was found. The dark precipitate was treated with 6 M HCl and centrifuged. The supernatant HCl solution was treated with 6M NH3 and H2S. No precipitate formed. Treatment of the dark residue with 6 M HNO3 produced a yellow precipitate. The dark residue had dissolved. After centrifugation, the supernatant was blue. Treatment of the blue solution with 6M NH3 followed by centrifugation produced a deep blue solution and a white precipitate. Put an X in the appropriate column in the Table below for each ion in the Group. Ion Definitely Present Definitely Absent Need More Information Bi3+ Cd2+ Cu2+ S

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Sixta Kovacek
Sixta KovacekLv2
23 Jul 2019

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(2p) Group III and IV Given the following facts, determine the metal present. A solution of the metals from groups III and IV was treated with NH3 and H2S. (1) The mixture was centrifuged; the solid was laid aside for future use. The supernatant liquid was treated with (NH4)2CO3. A white precipitate formed. The white precipitate was treated with 6M acetic acid. A clear solution resulted; the clear solution was treated with K2CrO4 and a yellow precipitate formed; the mixture above was centrifuge. The supernatant resulting was treated with (NH4)2C2O4; no precipitate resulted. The precipitate from (1) above was treated with 6 M HCl and dissolved completely; the solution obtained was treated with 6M NH3 and 3% H2O2. The mixture obtained was centrifuged. A yellow supernatant and a brown precipitate were obtained. The brown precipitate was dissolved in 6 M HCl and produced a deep red color when treated with KSCN. Write the formula of ions present in the original mixture. Put an X in the appropriate column in the Table below for each ion in the Group. Ion Definite present Definitely Absent Need more Information Cr+3 Fe+2 Ni+2 Ba+2 Ca+2

A student analyzing an unknown solution containing some of the cations studied in this module records the following results. At each step, indicate which cations are present and which have been proven absent from the unknown mixture.1) 4 drops of 6M HCl solution are added to the unknown solution and no precipitate2) The pH of the solution from (1) is raised to 9.5 by the addition of 6M NH3 solution. A cloudy, red-brown reaction mixture results3) The solution from (2) is centrifuged, and the colorless supernatant liquid is decanted into a separate container for later analysis. The precipitate is rinsed, and 6M NaOH solution is added. The mixture is heated and then centrifuged, resulting in a red-brown precipitate and a clear, colorless supernatant liquid.4) The precipitate from (3) is dissolved in 6M HCl solution, the pH is adjusted to 5, and 0.1M K4Fe(CN)6 solution is added to the precipitate, resulting in the formation of a dark blue precipitate in a blue solution5) When 6M HCl, aluminon, and 6M NH3 solutions are added to the second supernatant liquid from (3), a clear, red solution results.6) When 0.5M (NH4)2C2O4 solution is added to the first supernatant liquid from(2), a clear, colorless solution results7) The solution from (6) is heated to dryness with HNO3, and the residue dissolved in 6M HCl solution. The solution remains clear and colorless following the adjustment of the pH of the solution to 12 with the addition of 6M and 1M NaOH solution8) When 6M CH3COOH followed by 0.1M Na3Co(NO2)6 solutions are added to the solution from (7), a yellow precipitate forms.

A student analyzing an unknown solution containing some of the cations studied in this module records the following results. At each step, indicate which cations are present and which have been proven absent from the unknown mixture.1) 4 drops of 6M HCl solution are added to the unknown solution and no precipitate2) The pH of the solution from (1) is raised to 9.5 by the addition of 6M NH3 solution. A cloudy, red-brown reaction mixture results3) The solution from (2) is centrifuged, and the colorless supernatant liquid is decanted into a separate container for later analysis. The precipitate is rinsed, and 6M NaOH solution is added. The mixture is heated and then centrifuged, resulting in a red-brown precipitate and a clear, colorless supernatant liquid.4) The precipitate from (3) is dissolved in 6M HCl solution, the pH is adjusted to 5, and 0.1M K4Fe(CN)6 solution is added to the precipitate, resulting in the formation of a dark blue precipitate in a blue solution5) When 6M HCl, aluminon, and 6M NH3 solutions are added to the second supernatant liquid from (3), a clear, red solution results.6) When 0.5M (NH4)2C2O4 solution is added to the first supernatant liquid from(2), a clear, colorless solution results7) The solution from (6) is heated to dryness with HNO3, and the residue dissolved in 6M HCl solution. The solution remains clear and colorless following the adjustment of the pH of the solution to 12 with the addition of 6M and 1M NaOH solution8) When 6M CH3COOH followed by 0.1M Na3Co(NO2)6 solutions are added to the solution from (7), a yellow precipitate forms.

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