I didn't add any acids or bases in the experiment.
I forgot to tell you precisely what happened.
First, the solution turned green, then brown in many regions. ( I have no idea). There was no precipitate so I thought it was in suspension and filtered the solution with filter paper. The liquid that dripped out of the filter paper was brownish, for some reason. Green goo collected in the filter paper which was definately copper carbonate, but green goo? Copper carbonate is insoluble!
Does anyone know what might have caused the brown stuff? Thnks.