As I understand it, if I mix $\ce{[Ag(NH3)2]NO3}$ and $\ce{Na2EDTA}$ the silver will complex much more strongly with the EDTA than the ammonia, and the hydrogen ions will protonate the ammonia, leaving $\ce{AgEDTA^{3-} + 2NH4+ +NO3- + 2Na+}$, preventing the formation of silver nitride. Does that make sense? I'm concerned that the nitrate is incompatible with the EDTA somehow (that is, that it will oxidize something and break it apart).

  • $\begingroup$ Reaction is OK, but I don't get what you mean by "incompatible". $\endgroup$
    – Mithoron
    Commented Oct 19, 2019 at 22:58
  • 2
    $\begingroup$ He may mean mutual reaction, that would occur in concentrated nitric acid only. $\endgroup$
    – Poutnik
    Commented Oct 20, 2019 at 7:26
  • $\begingroup$ There would be needed review of complex stability constants. I am afraid for M+ ions and EDTA it would not be great, compared to ammonia.I would prefer acidification and silver recycling, e.g. by metallic zinc or solution based reduction agens. $\endgroup$
    – Poutnik
    Commented Oct 20, 2019 at 7:27
  • $\begingroup$ Silver has been found to form complex with EDTA: researchgate.net/publication/… $\endgroup$ Commented Oct 20, 2019 at 10:34
  • $\begingroup$ @Nilay Ghosh I rather mean, if it's stability constant is high enough to avoid forming diamminsilver complex. $\endgroup$
    – Poutnik
    Commented Oct 20, 2019 at 14:45


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