A solution may contain any or all of the group 3 cations Based on the informatio

Question

A solution may contain any or all of the group 3 cations Based on the information below, which group 3 ions are present, absent, or still in doubt alter each of the sequential steps below. Conclusions from each s cp will carry forward to the next step. (A flow chart will be helpful) Treatment of the solution with CIO^- in alkaline solution yields a yellow solution and a colored precipitate. Ions definitely Present ______ Ions definitely Absent ________ Ions in doubt _______ The yellow solution formed in (a) is acidified and treated with NH_3. No change is observed. Ions definitely Present _______ Ions definitely Absent _____ Ions in doubt _____ The colored precipitate in part (a) dissolves in nitric acid. Addition of excess 6M NH_3 to this acid solution produces only a blue solution with no precipitate. Ions definitely Present ______ Ions definitely Absent ________ Ions in doubt ______

Explanation / Answer

Qualitative analysis of metal cation

a. Tretment with ClO- in basic medium forms yellow solution with dark colored precipitate

ions present : Co2+, Pb2+,Cu2+

ions absent : Al3+,Fe3+

ions in doubt : Ba2+,Sr2+

(b) Acidifed and treated with NH3, no change

ions present : Pb2+,Cu2+

ions absent : Al3+,Fe3+

ions in doubt : Ba2+,Sr2+

(c) precipitate dissolved HNO3 and excess NH3 gave blue solution

ions present : Cu2+

ions absent : Al3+,Fe3+, Pb2+

ions in doubt : Ba2+,Sr2+

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