You can make Sb2O3 from Sb2S3 by dissolving it in concentrated HCl and then boiling the liquid for a while to drive off all H2S. It may be necessary
to filter the liquid if your SbS3 is not pure. You really need to boild for some while, to get rid of all H2S. Do the boiling outside or in a decent
fume hood. H2S is quite toxic and may deaden your sense of smell.
After the boiling, dump the liquid in a lot of water to which a little ammonia is added (if your solution contains 1% NH3 or so, it is OK). You get a
white precipitate, which is quite pure Sb2O3. Allow the precipitate to settle.
You may also get some algaroth (SbOCl) and if you did not boil the liquid sufficiently long, then you may get a pale yellow precipitate, which
contains some Sb2S3 as well. |