Schematic Diagram for the Separation of Group 1 Cations PDF

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ANALYTICAL CHEM_LAB...

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Name: Condrillon, Choren G.

Date: January 28, 2021 Experiment No.1

Schematic Diagram for the Separation of Group 1 Cations Mixture of Group 1 Cations: Ag+ , Hg22+ and Pb2+ Add 3-5 drops of 6M HCl shake then centrifuge and decant

White precipitate of AgCl, Hg2Cl2, and PbCl2

Solution contains remaining cations (supernatant liquid)

Wash with cold water containing 6M HCl*. Add 20 drops of hot water. Mix, heat in a boiling water bath and stir then centrifuge and decant

White precipitate of AgCl, Hg2Cl2 Wash with hot water. Add 10 drops of 6M NH4OH then centrifuge and decant

Grey precipitate indicates the presence of Hg22+ ion

(For complete precipitation, add another drop of 6M HCl to verify ions precipitating have been removed.)

Solution contains Pb2+ Add 2 drops 0.2M K2CrO4

Yellow precipitate confirms presence of Pb2+

Solution contains Ag+ Divide the filtrate

Add 10 drops of 6M HNO3

White precipitate indicates the presence of Ag+ ion

dd 2 drops of 0.1M KI

Pale yellow precipitate indicates the presence of Ag+ ion...