Lingrui Ge
Lab report October 18, 2015
Experiment #5
Separation and Qualitative Analysis of Cations
CHEM 1315-088 Purpose of the experiment:
To identify the substances that are present in a mixture.
Materials:
Test Solutions and Substances
6 M hydrochloric acid, HCl
Sodium bismuthate, NaBiO3 (s)
6 M nitric acid, HNO3
0.1 M potassium thiocyanate, KSCN
6 M ammonia/ammonium hydroxide, NH3
3% hydrogen peroxide, H2O2
6 M sulfuric acid, H2SO4
Sodium bismuthate, NaBiO3 (s)
6 M sodium hydroxide, NaOH
Cation Solutions
0.2 M silver nitrate, AgNO3
0.5 M lead (II) nitrate, Pb(NO3)2
0.2 M mercury (I) nitrate, Hg2(NO3)2
0.2 M iron (III) nitrate, Fe(NO3)3
0.2 M copper (II) nitrate, Cu(NO3)2
0.2 M manganese (II) nitrate, Mn(NO3)2
Equipment …show more content…
You should have 10 clear test tubes, bath them by hot water.
Test 1a: put a known solution in tube 1 and add three drops of each of the 10 cation solutions.
Add 8 drops 6 M HCl solution to tube 1 and do it one more time. If it forms precipitate, you should continue add HCl. Record this data on table 1a.
Test 1b:
Centrifuge the content of tube 1 and add a drop of 6 M HCl. If precipitate forms, you should continue add HCl until the supernatant remains clear.
Centrifuge the tube 1 again and put them into tube 4.
Add 1 mL of distilled water to tube 1, stir it. Centrifuge the test tube 1.
Test the precipitate in test tube 1 for Pb2+ ions by first adding 1 mL of distilled water to test tube
Place test tube 1 in the hot water bath, which should be at or very near boiling, for about 3 minutes.
Test 1c:
Prepare 6 M NH3 solution and add 1 mL of it to test the precipitate in test tube 1 for Hg2+. Then put the supernatant to tube 3.
Test 1d:
Add 15 drops of 6 M HCl solution to test tube and check the pH. When a white precipitate appears in the tube, the conclusion is that Ag+ ions …show more content…
When the liquid is basic, add 3 more NaOH and put the tube in hot water for 3 min. when it is done, put them to tube 10 and add 10 drops NaOH and 10 drops of distilled water to the test tube 4. Put 5 drops water to tube 4. Add H2SO4 to tube 4 until the solution is acidic and check pH. Finally, centrifuge tube 4 and discard the
Lab report October 18, 2015
Experiment #5
Separation and Qualitative Analysis of Cations
CHEM 1315-088 Purpose of the experiment:
To identify the substances that are present in a mixture.
Materials:
Test Solutions and Substances
6 M hydrochloric acid, HCl
Sodium bismuthate, NaBiO3 (s)
6 M nitric acid, HNO3
0.1 M potassium thiocyanate, KSCN
6 M ammonia/ammonium hydroxide, NH3
3% hydrogen peroxide, H2O2
6 M sulfuric acid, H2SO4
Sodium bismuthate, NaBiO3 (s)
6 M sodium hydroxide, NaOH
Cation Solutions
0.2 M silver nitrate, AgNO3
0.5 M lead (II) nitrate, Pb(NO3)2
0.2 M mercury (I) nitrate, Hg2(NO3)2
0.2 M iron (III) nitrate, Fe(NO3)3
0.2 M copper (II) nitrate, Cu(NO3)2
0.2 M manganese (II) nitrate, Mn(NO3)2
Equipment …show more content…
You should have 10 clear test tubes, bath them by hot water.
Test 1a: put a known solution in tube 1 and add three drops of each of the 10 cation solutions.
Add 8 drops 6 M HCl solution to tube 1 and do it one more time. If it forms precipitate, you should continue add HCl. Record this data on table 1a.
Test 1b:
Centrifuge the content of tube 1 and add a drop of 6 M HCl. If precipitate forms, you should continue add HCl until the supernatant remains clear.
Centrifuge the tube 1 again and put them into tube 4.
Add 1 mL of distilled water to tube 1, stir it. Centrifuge the test tube 1.
Test the precipitate in test tube 1 for Pb2+ ions by first adding 1 mL of distilled water to test tube
Place test tube 1 in the hot water bath, which should be at or very near boiling, for about 3 minutes.
Test 1c:
Prepare 6 M NH3 solution and add 1 mL of it to test the precipitate in test tube 1 for Hg2+. Then put the supernatant to tube 3.
Test 1d:
Add 15 drops of 6 M HCl solution to test tube and check the pH. When a white precipitate appears in the tube, the conclusion is that Ag+ ions …show more content…
When the liquid is basic, add 3 more NaOH and put the tube in hot water for 3 min. when it is done, put them to tube 10 and add 10 drops NaOH and 10 drops of distilled water to the test tube 4. Put 5 drops water to tube 4. Add H2SO4 to tube 4 until the solution is acidic and check pH. Finally, centrifuge tube 4 and discard the