Qualitative Analysis
Gr I, Ag+, Pb2+, and Hg22+
- Add C? -(aq) and look for precipitate
Gr II, Cu2+, Bi3+, Hg2+, Cd2+, Sn4+, Sb3+, form insoluble silfides
Gr III, Ni2+, Co2+, Fe2+, Mn2+, An2+, Al3+, and Cr3+, form either soluble silfides (in base they are insoluble) and the latter two precipitate as hydroxides.
Gr IV, Mg2+, Ca2+, and Ba2+, form solid carbonates