Question

Sect. Date Name Prelaboratory Assignment: Qualitative Analysis Group III Cations 1. Prepare a complete flow chart for the procedure and put it on your data sheet. 2. Write balanced net ionic equations describing each of the following reactions: Dissolution of Ni(OH), in nitric acid. Oxidation of Cr'to Cr by CIO in alkaline solution (CIO is converted to CI') The confirming test for Fe 3. A solution that may contain any of the group II cations. Treatment of the solution with CIO in alkaline medium yields a yellow solution and a colored precipitate. The acidified solution is unaffected by treatment with NH,OH. The colored precipitate dissolves in nitric acid; addition of excess NH,OH to this acidic solution produces only a blue solution. Which group III ions are present? Which are absent? Which are in doubt? How would you remove all doubt? 149

Answer 1

SOLN 1 procedure is not provided

SOLN 2

a. Net Ionic Equation : Ni(OH)2 (s) + 2H+ (aq) ---> 2H2O (l) + Ni2+ (aq)

b. oxidation of Cr3+ : Cr⁺³+ClO^-+H₂O-------------->Cl^-+2OH^-+Cr⁺⁶+3e^-

c. Fe3+ + sulfosalicylic acid ---> Fe(sulfosalicylate) (aq)
when we react any Ferric ion i.e Fe3+ with sulfosalicylic acid it will result in the formation of a complex which will turn to  wine/blood red . This confirms the presence of iron 3+ being present

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