Is this sulphur? [closed]








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I was electroplating with a copper sulfate electrolyte, and now a yellow substance has settled at the bottom of the container, is it sulphur from the copper sulfate or something else from the screw I electroplated?


If it is sulphur, how can I safely remove it?


Thanks for any help you can give me.




The yellow precipitate is probably cuprous oxide $\ce{Cu2O}$ which is insoluble, and which is produced in the electrolysis of $\ce{CuSO4}$if the solution is not acidic enough. Check by adding some acidic solution, like concentrated HCl. If the yellow precipitate is sulfur it will not be attacked by the acid. If it is $\ce{Cu2O}$, il will soon be dissolved and produce a colorless solution, due to : $$\ce{Cu2O + 4HCl ⟶ H2CuCl2 + H2O}$$


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