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).
5
-
$\begingroup$ Reaction is OK, but I don't get what you mean by "incompatible". $\endgroup$– MithoronOct 19, 2019 at 22:58
-
2$\begingroup$ He may mean mutual reaction, that would occur in concentrated nitric acid only. $\endgroup$– PoutnikOct 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. $\endgroup$– PoutnikOct 20, 2019 at 7:27
-
$\begingroup$ Silver has been found to form complex with EDTA: researchgate.net/publication/… $\endgroup$– Nilay GhoshOct 20, 2019 at 10:34
-
$\begingroup$ @Nilay Ghosh I rather mean, if it's stability constant is high enough to avoid forming diamminsilver complex. $\endgroup$– PoutnikOct 20, 2019 at 14:45
Add a comment
|