Housane - 23-12-2018 at 13:26
Hi all when making copper citrate from trisodium citrate and Copper Sulfate I get an odd green solution post filtering. I have a green powder which I
assume is copper citrate but this solution is left. Does anyone know what this is. Picture attached
I followed prep from a pdf from RSC
fusso - 23-12-2018 at 13:33
Some kind of Cu(II) citrate complex?
Housane - 23-12-2018 at 14:17
Odd bc i have some decent yeild of the powder. BTW i am a noob so please could you explain whuat a complex is
##EDIT##
is there any wat of recovering the green solutin into pure copper (II) citrate or is it too dificult to bother?
Thanks foe the help
[Edited on 23-12-2018 by Housane]
fusso - 23-12-2018 at 14:41
This is what you want to know:
https://en.wikipedia.org/wiki/Coordination_complex
Ubya - 23-12-2018 at 16:13
copper citrate is slighly soluble in water, maybe it's just that, some copper citrate in solution
mayko - 23-12-2018 at 16:17
In my experience, complexed citrate and copper are a deep blue rather than green, and the remaining liquid in this reaction is usually a pale light
blue. A green color is more characteristic of a copper-chloride complex; any chloride contamination?
Since copper citrate dissolves in alkaline citrate solutions, you might be able to drive the reaction to completion by adding excess copper. However,
I doubt there's enough left in the solution to be worth your while.
One thing I've found about the RSC procedure is that it's very sluggish without heating. You could try heating the residual liquid to see if any more
product precipitates.
If you haven't checked it out already, there's some info & pix in this thread:
https://www.sciencemadness.org/whisper/viewthread.php?tid=62...
Housane - 24-12-2018 at 01:05
I did heat it to speed it along and will try to add more Copper Sulfate but it would strange if it was chloride contaminanation as there were no
chlorides used even to make the sodium citrate I used sodium carbonate. pH of green solution is 4/5 picture of product post filtering attached
[Edited on 24-12-2018 by Housane]
