The method of clearly_not_atara is not practical and does not lead to satisfactory results. It is very messy. You end up with a very complicated mix
of thiosulfate, sulfide, polysulfides, hydroxide and possibly some sulfite as well. You are a very good boy if you can isolate pure Na2S from this.
Keep in mind that Na2S is very hygroscopic and quite air-sensitive.
If you want pure Na2S, then bubbling H2S through NaOH-solution indeed is the way to go, but as mentioned already, you must know the risks and be
capable of dealing with them properly. H2S is very toxic and it may knock you down easily, when released in somewhat greater quantities (user Klute
has written on sciencemadness about his frightening experience with H2S a few years ago, use the search engine to find that thread). If you bubble
this gas through a solution of NaOH then you must use a good fumehood, or work outside on a breezy day. If you don't want the stink, then a good way
of getting rid of not absorbed gas is leading it into a flame. It burns to SO2 and water. H2S is flammable, but to be sure, I would use an external
flame, because flames of H2S itself tend to go out easily. SO2 also is toxic, but much less so than H2S and if you do this outside, then you do not
stink up the neighborhood. SO2 smells more like burnt fireworks or some kinds of matches, albeit not exactly so. Anyway, it is much less alarming than
the smell of H2S. |
