Chem116LFINAL LabReport

Chem116LFINAL LabReport - Jharrett Carrillo 8. Qualitative...

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Jharrett Carrillo 8. Qualitative Analysis of Cations Identification of Ag + Ag1. To 20 drops of Ag+ solution , 1 drop of 3M HCl was added. A curdy white precipitate formed. Ag + (aq) Cl - (aq) AgCl (s, white) To this precipitate, 6 M NH 3 was added. The white precipitate dissolved. 6M HNO 3 was added, causing the precipitate to reform. AgCl (s) + 2 NH 3 (aq) Ag(NH 3 ) 2 + (aq) + Cl - (aq). Ag(NH 3 ) 2 + + Cl - (aq) + 2 HNO 3 (aq) AgCl (s) + 2 NH 4 + (aq) +2NO 3 - (aq) Ag2. To 10 drops of Ag + , 1 drop of .5M K 2 CrO 4 was added. An orange precipitate of Ag 2 CrO 4 formed. Ag + (aq) + CrO4 - (aq) Ag 2 CrO 4 (s, orange) Ag3. 1M KI was added to 10 drops of Ag + . A pale yellow precipitate formed. Ag + (aq) + I - (aw) AgI (s, pale, yellow) Ag4. 5 drops of .1M Na 2 S 2 O 3 was added to 10 drops of Ag + solution. The solution went from a milky white color to orange-red to a very dark brown color to black. 2Ag + (aw) + S 2 O 3 2- (aq) Ag 2 S 2 O 3 (s, white) turns to black Ag 2 S. Identification of Pb 2+ Pb1. To 10 drops of Pb 2+ , 1 drop of 3M HCl was added. A white precipitate formed. Pb 2+ (aq) + 2Cl - (aq) PbCl 2 (s, white) To the precipitate, H 2 O was added and the solution was put into a boiling water bath. The precipitate dissolved. PbCl 2 (s, white) Pb 2+ (aq) + 2Cl - (aq) Pb2: To 10 drops of Pb 2+ , 3 drops of 6M acetic acid and 10 drops of .5 M K 2 CrO 4 was added. A yellow precipitate formed. Pb 2+ (aw) + CrO 4 2- (aw) PbCrO 4 (s, yellow)
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Jharrett Carrillo 8. Qualitative Analysis of Cations Pb3. To 10 drops of Pb 2+ , 1 drop of 1 M KI was added. A yellow precipitate formed. Pb 2+ (aq) + CrO 4 2- (aq) PbI 2 (s, yellow) Two mL of H 2 O was added and heated. The precipitate dissolved. PbI 2 (s, yellow) + heat Pb 2+ (aw) + CrO 4 2- (aq) Identification of Copper (II) ion, Cu 2+ Cu1. To 10 drops of Cu 2+ solution, 1 drop of 1M HCl was added along with 10 drops of 1 M thioacetamide. The solution was put into a boiling water bath, resulting in a black precipitate. H 3 C-C(=S)-NH 2 +2H 2 O H 3 C-C(=O+-O- + H 2 S NH 4 + H 2 S (aq) 2H + + S 2 - (aq) Cu 2+ (aq, blue) + S 2 - CuS (s, black) Cu2. To 10 drops of Cu 2+ , 1 drop of 6 M CH 3 COOH was added. 2 drops of potassium ferrocyanide was added, resulting in a brick red precipitate. Cu 2+ (aq) + K 4 [Fe(CN) 6 ] Cu 2 [Fe(CN) 6 ] (s!, brick red) + 4K + Cu3. 3M of NH 3 was added to 10 drops of Cu 2+ solution. A gray precipitate formed. Upon adding additional NH 3 , the precipitate dissolved, resulting in a clear dark blue solution. NH 3 (aq) + H 2 O NH 4 + (aq) + OH - C2 + + 2OH - Cu(OH) 2 (s, gray) Cu 2+ + 2NH 3 (aq) Cu(NH 3 ) 4 2+ (aq, dark blue) Identification of Cd 2+ Cd1. To 10 drops of Cd 2+ solution, 1 drop of HCl an 10 drops of 1M thioacetemide was added. A bright yellow precipitate formed
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Chem116LFINAL LabReport - Jharrett Carrillo 8. Qualitative...

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