Ag , Pb2 , Hg22

1
Ag, Pb2, Hg22 Cu2, Bi3, Cd2, Hg2, H2AsO3-,
AsO43-, Sb3, Sn2, Sn4 Al3, Fe2, Fe3, Co2,
Ni2, Cr3, Zn2, Mn2 Ba2, Ca2, Mg2 Na, K,
NH4
Add 6M HCl
Precipitate
Insoluble Chlorides AgCl, Hg2Cl2, PbCl2
Cu2, Bi3, Cd2, Hg2, H2AsO3-, AsO43-, Sb3,
Sn2, Sn4 Al3, Fe2, Fe3, Co2, Ni2, Cr3,
Zn2, Mn2 Ba2, Ca2, Mg2 Na, K, NH4
Group 1
Add H2S, 0.2M HCl
Precipitate
Al3, Fe2, Fe3, Co2, Ni2, Cr3, Zn2,
Mn2 Ba2, Ca2, Mg2 Na, K, NH4
Acid-Insoluble Sulfides CuS, Bi2S3, CdS, HgS,
As2S3, Sb2S3, SnS2
Group 2
Add (NH4)2S, pH 8.0
Precipitate
Ba2, Ca2, Mg2 Na, K, NH4
Base-Insoluble Hydroxides and Sulfides Al(OH)3,
Fe (OH)3, Cr(OH)3, CoS, NiS, ZnS, MnS
Add (NH4)2HPO4
Group 3
Precipitate
Na, K, NH4
Insoluble Phosphates Ba3(PO4)2, Ca3(PO4)2,
MgNH4PO4
Group 5
Group 4