[ade93]

Hi
  I would be very happy if someone could give me a method to get the silver from Na3[Ag(S2O3)2], I got it first by dissolving silver chloride with sodium thiosulphate (AgCl(s) + 2S2O32−(aq) → [Ag(S2O3)2]3−(aq) + Cl−(aq) )
 
  Also, is there any way to obtain the silver chloride by reversing the reaction? Should it be in a freezer?

 Have good day! 
  / Adam, 17

[ampakine]

Thiosulphate is a pretty weak field ligand, its well below H2O on the spectrochemical series. I'm taking a wild guess here but I'd say add concentrated ammonia solution to replace the thiosulphate ligand with NH3. Reacting with HCl then should cause the NH3 ligand to be replaced with H₂O and adding excess HCl should cause AgCl to precipitate out. Like I said that was all a wild guess, I have no idea if any or all of that will work but theres only 1 way to find out.

EDIT: Ah wait that makes no sense. You'd just be stuck with the [Ag(H₂O)₂] ion.

[Athiril]

If you wanted elemental silver. You can take the silver halide and reduce it with ascorbic acid + sodium hydroxide. pH 11-12. Paracetamol + sodium hydroxide + sodium sulphite, hydroquinone + sodium hydroxide + sodium sulphite would all work too.

[Borek]

This is a known problem, google for silver recovery/reclaiming from spent/waste fixing bath/solution.

[Athiril]

A new device came out last year for that for the home user.

http://www.apug.org/forums/forum146/68135-silver-magnet-silver-recovery-device.html