1) Obtained and set up 10 test tubes on a rack
2) Poured 200 mL of deionized water and placed it on the hot plate with a thermometer until it reached 80*C
3) Labeled each test 1-10
-Measure 1mL of an unknown solution into the test tube.
-Add 2 mL of 6 M NaOH with a plastic pipet into the test tube.
-Waft the test tube to observe the presence of ammonia.
-Place 2mL of an unknown solution into a test tube.
-Add 2-3 drops of 6 M HCl. Observed if any precipitate formed. If no precipitate forms then save the solution for procedure 6.
-Centrifuge the mixture in a disposable test tube and then add 1 drop of 6 M HCl
-If no precipitate forms then separate supernatant into a separate test tube.
-If precipitate formed, reapeat last two steps until no precipitate forms.
-Label each sample and save the supernatant for procedure 6 and use the precipitate for procedure 3.
-Add 3-4 mL deionized water to the precipitate from Procedure 2 with clean pipet.
-Heat the test tube, stirring it while in a hot water bath for several minutes.
-After the heating, centrifuge the test tube to separate the supernatant from any remaining precipitate.
-Saved the supernatant for procedure 5 and precipitate for procedure 4.
-Add 10 drops 6 M ammonia solution to the precipitate from Procedure 3 and stir.
-Add 6 M HCl drop by drop until the precipitate reappears.
-If the solution from Procedure 3 contains any precipitate, reheat it in the water bath until the precipitate dissolves completely.
-Separate the sample into two test tubes and add several drops of 3 M H2SO4 to one of the test tubes.
-Add a couple of drops of potassium chromate to the second test tube then stir.
-Add 6 M NaOH to the supernatant from Procedure 2 until precipitate forms.
-Add 0.5 mL more of the NaOH and stir.
-Separate the supernatant from any precipitate and save them for Procedure 11 and 7.
-Add 3 mL of 6M ammonia and stir well.
-Separate the supernatant and save it for procedure 10 and the precipitate for procedure 8.
-Add 1 mL of 3% hydrogen peroxide solution to the precipitate from Procedure 7.
-Stir well then heat the solution until no more gas appears.
-Add 3 M H2SO4 by drops until the mixture is acidic.
-Seperate the supernatant and save for procedure 9.
-Add 2 drops of 0.2 M K4(Fe(CN)6) to the solution from Procedure 8.
-Add 1 drop of 6 M HCL then add 5 drops of dimethylglyoxime reagent to the solution from Procedure 7.
-Neutralize the solution from Procedure 6 by adding 3 M H2SO4 and use the pH paper to test the pH after adding each drop.