Chapter 38

Write balanced net ionic equations for the following reactions: a. Dissolving of \(\mathrm{Ni}(\mathrm{OH})_{2}\) in nitric acid. b. Oxidation of \(\mathrm{Cr}^{3+}\) to \(\mathrm{CrO}_{4}^{2-}\) by \(\mathrm{OCl}^{-}\) in alkaline solution (OCl- is converted to \(\mathrm{Cl}^{-}\) ). c. The reaction of \(\mathrm{Ni}^{2+}\) that separates it from \(\mathrm{Fe}^{3+}\). d. The confirmatory test for \(\mathrm{Fe}^{3+}\)

A solution may contain any of the Group III cations. Treatment of the solution with OCI- in alkaline medium yiclds a ycllow solution and a colored precipitate. The acidificd solution is unaffected by treatment with \(\mathrm{NH}_{3}\). The colored precipitate dissolves in nitric acid; addition of excess \(\mathrm{NH}_{3}\) to this acid solution produces only a blue solution. On the basis of this information, which Group III cations are present, abscnt, or still in doubt? Present __________ Absent __________ In doubt __________