Chapter 37

Write balanced net ionic equations for the following reactions: A. Precipitation of the \(\operatorname{tin}(\mathrm{IV})\) sulfide with \(\mathrm{H}_{2} \mathrm{S}\). B. The confirmatory test for tin. C. The confirmatory test for copper. D. The dissolving of \(\mathrm{Bi}_{2} \mathrm{S}_{3}\) in hot nitric acid.

A solution that may contain \(\mathrm{Cu}^{2+}, \mathrm{Bi}^{3+}, \mathrm{Sn}^{4+},\) or \(\mathrm{Sb}^{3+}\) ions is treated with thioacetamide in an acid medium. The black precipitate that forms is partly soluble in strongly alkaline solution. The precipitate that remains is soluble in \(6 \mathrm\quad{M}\) \(HNO\), and gives only a white precipitate with excess \(\mathrm{NH}_{3}\). The alkaline solution, when acidified, produces an orange precipitate. On the basis of this information, which ions are present, which are absent, and which are still in doubt? Present __________ Absent __________ In doubt __________