Why do we have to turn the solution very acidic first before we convert the ions into sulfides? Why don't we just make the sulfides first with the unknown?
1. because some sulfides precipitate from Group 3 and we would not be able to separtate them from the Group 2 ions.
2. because the acid really makes the ions precipitate faster
3. because the amount of acid used allows us to use lesser amounts of costly thioacetamide
4. Because sulfides can only be made with acid solutions
5. because hydrogen sulfide ions are easier to precipitate