A solution may contain any of the Group 3 cations. Treatment of the solution wit

Question

A solution may contain any of the Group 3 cations. Treatment of the solution with NaOCl in alkaline medium yields a yellow solution and a colored precipitate. The acidied solution is unaffected by treatment with ammonia. The colored precipitate dissolves in nitric acid, addition of excess ammonia of the acid solution produces only a blue solution. On the basis of this information only, which cations are present, absent or still in doubt because of no confirmatory test. Present: ___________ Absent: ___________ In Doubt:________ (fill in the above blanks)

Explanation / Answer

Present: Ni2+ and Cr3+ Absent:Al3+ ion, In doubt:Fe3+ ion

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