In the qualitative analysis scheme for metal ions,how are the Analytical Group III cations separated from the cations of Analytical Groups IV and V?

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The Analytical Group III cations (Fe3+, Al3+, Cr3+) can be separated from the cations of Analytical Groups IV and V (Mn2+, Ni2+, Zn2+, Co2+, Pb2+, Cd2+) by adding HS- in basic solution. This will form insoluble metal sulfides or hydroxides for the Analytical Group III cations, while the cations of Groups IV and V will remain in solution as metal ions. This separation is based on the differing solubility properties of the metal sulfides or hydroxides formed.

In the Qualitative Analysis Scheme for Metal Ions,how Are the Analytical