Posted by lydia on Tuesday, October 9, 2012 at 6:24pm.
You have changed the oxidation state of Co from III to II and you DON'T show a corresponding change for anything else.
So cobalt(III) carbonate will be Co2(CO3)3
Some other points I should make. Co(OH)3 is not very soluble in water. With no phases shown I doubt there would be anyreaction between two solids. Even with aqueous Na2CO3, the possibility of a reaction depends upon the solubility product of Co(OH)3 vs Cu2(CO3)3; i.e., which is more insoluble.
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