Prepare a complete flow diagram for the separation and identification of the Group II cations and put it on the data page for this experiment. Write balanced net ionic equations for the following reactions: a. Precipitation of tin(IV) sulfide with H_2S b. The confirmatory test for antimony c. The confirmatory test for copper d. The dissolution of Bi_2S_3 in hot nitric acid A solution that may contain Cu^2+, Bi^3+, Sn^4+, and/or 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 M HNO_3 and gives only a blue solution on treatment with excess 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? (As with Group I, evidence other than confirmatory tests may indicate the presence or absence of an ion.) Present _____ Absent _____ In doubt _____