Make a scheme with this procedure. Write the result. Procedure 1. Place 20 drops of each of the following aqueous solutions to separate centrifuge tubes: 0.1M Cr (NO3)3, 0.1M Al (NO3)3, 0.1M Co (NO3)2, 0.1M Zn (NO3)2, 0.1M Mn (OH)2, 0.1M Ni (NO3)2, 0.1 M Fe (NO3)3. Make each solution basic by adding few drops of 6M NH4OH. Confirm using a litmus paper. 2. Add 5 drops of freshly prepared 6M (NH4)2S to each centrifuge tube. Place the samples in the centrifuge machine for 3 mins. After centrifuge record results. Decant the supernatant liquid of all the samples. 3. Add one drop of NH4OH in each centrifuge tubes. Add 20 drops of distilled water in each centrifuge tubes. Then add a few drops of 6M HCl in each solution. Place the samples in the water bath for 10 mins. After water bath, centrifuge the samples for 3 mins. 4. After centrifuge, add a few drops of 6M NH4Cl in each sample. Decant the supernatant liquid in each sample. 5. To the centrifuge containing Al+3 and Cr+3, slowly add few drops of 6M acetic acid to solution until it is acidic (test with blue litmus paper). After, add concentrated NH3 one drop at a time until the solution just becomes basic again (test with red litmus paper). Stir the mixture for about a minute to allow the system to reach equilibrium. Decant the supernatant liquid if there is a precipitate produced. 6. To the precipitate containing Al+3, add four drops of 6M CH3COOH and 2 mL of DI water. 7. To the centrifuge tube containing Cr+3, add twelve drops of 1 M BaCl2. 8. To the mixtures containing Zn+2, Fe+3, and Mn+2, add 10 drops of 6M NaOH and 3% H2O2 solution. Warm the mixture in the water bath for a few minutes. Centrifugeand decant. 9. To the precipitate containing Fe+3, add 12 drops of 6M HCl and 1 mL of DI water. Stir the solution then, add a few drops of 0.5M KSCN. 10. To the precipitate containing Mn+2, add 5 drops of conc. HNO3 and 5 drops and 3% H2O2. Warm the mixture and then, add a pinch of NaBiO3. 11. To the solution containing Zn+2, acidify with a few drops of 6M CH3COOH and add 3- 5 drops of H2S. 12. To the mixtures containing Ni+2 and Co+2, add 5 drops of 6M HNO3 and 1 mL of DI water. Warm the mixture in the water bath for about one minute. 13. After the bath, to the solution containing Ni+2, add NH4OH or NH4Cl to make the solution alkaline and add 8 drops of dimethylglyoxime (DMG). 14. To the solution containing Co+2, acidify by adding a few drops of 6M CH3COOH and add 5 drops of 0.2M KNO2.
Make a scheme with this procedure. Write the result.
Procedure
1. Place 20 drops of each of the following aqueous solutions to separate centrifuge tubes: 0.1M Cr (NO3)3, 0.1M Al (NO3)3, 0.1M Co (NO3)2, 0.1M Zn (NO3)2, 0.1M Mn (OH)2, 0.1M Ni (NO3)2, 0.1 M Fe (NO3)3. Make each solution basic by adding few drops of 6M NH4OH. Confirm using a litmus paper.
2. Add 5 drops of freshly prepared 6M (NH4)2S to each centrifuge tube. Place the samples in the centrifuge machine for 3 mins. After centrifuge record results. Decant the supernatant liquid of all the samples.
3. Add one drop of NH4OH in each centrifuge tubes. Add 20 drops of distilled water in each centrifuge tubes. Then add a few drops of 6M HCl in each solution. Place the samples in the water bath for 10 mins. After water bath, centrifuge the samples for 3 mins.
4. After centrifuge, add a few drops of 6M NH4Cl in each sample. Decant the supernatant liquid in each sample.
5. To the centrifuge containing Al+3 and Cr+3, slowly add few drops of 6M acetic acid to solution until it is acidic (test with blue litmus paper). After, add concentrated NH3 one drop at a time until the solution just becomes basic again (test with red litmus paper). Stir the mixture for about a minute to allow the system to reach equilibrium. Decant the supernatant liquid if there is a precipitate produced.
6. To the precipitate containing Al+3, add four drops of 6M CH3COOH and 2 mL of DI water.
7. To the centrifuge tube containing Cr+3, add twelve drops of 1 M BaCl2.
8. To the mixtures containing Zn+2, Fe+3, and Mn+2, add 10 drops of 6M NaOH and 3% H2O2 solution. Warm the mixture in the water bath for a few minutes. Centrifugeand decant.
9. To the precipitate containing Fe+3, add 12 drops of 6M HCl and 1 mL of DI water. Stir the solution then, add a few drops of 0.5M KSCN.
10. To the precipitate containing Mn+2, add 5 drops of conc. HNO3 and 5 drops and 3% H2O2. Warm the mixture and then, add a pinch of NaBiO3.
11. To the solution containing Zn+2, acidify with a few drops of 6M CH3COOH and add 3- 5 drops of H2S.
12. To the mixtures containing Ni+2 and Co+2, add 5 drops of 6M HNO3 and 1 mL of DI water. Warm the mixture in the water bath for about one minute.
13. After the bath, to the solution containing Ni+2, add NH4OH or NH4Cl to make the solution alkaline and add 8 drops of dimethylglyoxime (DMG).
14. To the solution containing Co+2, acidify by adding a few drops of 6M CH3COOH and add 5 drops of 0.2M KNO2.
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