ch3misc00l - 8-10-2015 at 14:45
I just maked a solution of copper citrate by electrolysis of citric acid with copper electrodes. Last day i filtered it and i heated a small sample of
the solution in a test tube, but when all water is gone the solid seems to decompose to a brown gelatin-like thing.How i can crystallize it? Thanks.
[Edited on 8-10-2015 by ch3misc00l]
Detonationology - 9-10-2015 at 10:20
Did you use "citric acid" or just a citrus juice? If juice was used, the pulp from the fruit might be the cause. Copper Citrate isn't very solubly,
so I doubt it will be possible to filter it. Have you checked out this
thread about copper citrate?
[Edited on 10-9-2015 by Detonationology]
ch3misc00l - 9-10-2015 at 11:10
Yes, i used clarified lemon juice, i will try electrolysis again with pure citric acid. This is a sample of the solution :
Is the white precipitate actually the copper citrate? I maded it this way:
1-add the lemon juice to a beaker.
2-do a 12v dc electrolysis with copper electrodes.
3- next day i filtered it when the electrodes were destroyed.
4- i added calcium carbonate to neutralize excess citric acid and filtered the insoluble calcium citrate.
5- then i boiled it down to a syrup-like liquid , but i don't removed all water because the compound seems to decompose when all water is out .
[Edited on 9-10-2015 by ch3misc00l]
[Edited on 9-10-2015 by ch3misc00l]
ch3misc00l - 9-10-2015 at 12:36
I finally dried it 
. I heated it to the smallest amount of water possible
without decomposing the compound and then i dried it with a hair dryer.
It's a curious compound because it is green in anhydrous form but it forms a blue-green solution.
[Edited on 9-10-2015 by ch3misc00l]
DraconicAcid - 9-10-2015 at 12:45
Odd. The CRC handbook assures me that copper(II) citrate is insoluble in water.
ch3misc00l - 9-10-2015 at 13:18
I dissolved a small amount in water . It forms a greener solution than before. Maybe it always decomposed a little although i heated it carefully.
[Edited on 9-10-2015 by ch3misc00l]