Housane
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Odd Green Solution
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
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fusso
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Some kind of Cu(II) citrate complex?
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Housane
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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]
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fusso
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This is what you want to know:
https://en.wikipedia.org/wiki/Coordination_complex
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Ubya
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copper citrate is slighly soluble in water, maybe it's just that, some copper citrate in solution
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mayko
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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...
al-khemie is not a terrorist organization
"Chemicals, chemicals... I need chemicals!" - George Hayduke
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Housane
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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]
Green QD's so far
Feel free to correct grammar or incorect knknowledge. We are all learning.
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