2. Write balanced net ionic equations for the following reactions: a. Precipitation of tin(IV) sulfide with H2S b. The confirmatory test for antimony c. The dissolution of B2S3 in hot nitric acid d. The confirmatory test for copper 3. A solution that may contain Cu2+,Bi3+,Sn4+, and/or Sb3+ 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 6MHNO3 and gives only a blue solution on treatment with excess NH3. 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? State your reasoning. Note: For "paper unknowns" such as this one, confirmatory tests are usually not included, and you do not need to provide any. The information provided here, without confirmatory tests, is sufficient to clearly indicate the presence or absence of some of the Group II ions studied in this experiment, while leaving others in doubt. Present Absent In doubt