An aqueous solution contains two or more of the following cations: Ag+ , Al3+ ,

Question

An aqueous solution contains two or more of the following cations: Ag+ , Al3+ , Fe3+ , Mn2+ , NH4(+) , Ni2+ , Pb2+. The sample was tested with a cation classification scheme, the following observations were made. A. The solution is light green in color. B. Addition of 6M HCl to the solution produced whit precipitate. C. The precipitation from step B did not dissolve in hot DI water, but did dissolve in 6M NH3. D. Addition of 6M NaOH to the oridinal solution did not produce a gas ( red litmus paper suspended over the solution stayed red) but did produce a pale green precipitate. E. Addition of 6M NaOH to the solution from step b ( after the precipitate was removed ) produced a green precipitate. F. The entire precipitate from step e was dissolved when 6M NH3 was added. Identify the cations present in the solution. Clearly state the reasons for your answer including your reasons for eliminating cations you do not think are in the solution. If the data is insufficient to definitively identify which cations are present, suggest and experiment or series of experiments that would allow you to accomplish this.

Explanation / Answer

(A) Ni2+ (B) Ag+ , Pb2+ (C) Ag+ (D) Cr3+ (E) Mn2+ (F) NH4+

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