Copper is found in two types of ore: copper-rich and copper-poor ores. Which of the following is not a common industrial method for removing copper from its ores?
One of the final steps of copper refining is electroplating copper onto a copper electrode. When the deposited copper comes from a copper sulfate solution, such as that produced from sulfuric acid leaching, the process is called electrowinning.
In electrowinning, a lead anode and a copper cathode are immersed in a bath of copper(II) sulfate, and a potential difference is applied.
What is the half-equation of the reaction that occurs at the cathode?
What is the half-equation of the reaction that occurs at the anode?
Smelting of copper ores produces an impure material, which can be converted to pure copper using the electrolysis apparatus illustrated in the diagram. An electrical current causes the immersed cathode to be coated with pure copper, while less reactive impurities fall to the bottom of the cell.
What is the half-equation of the reaction taking place at the anode?
What is the half-equation of the reaction taking place at the cathode?
A 95.0 kg pure copper cathode has a surface area of 1.50 m2 and a density of 9.00 g/cm3. The cathode is electroplated with a layer of pure copper 2.00 mm in thickness. It is assumed that the cathode is coated evenly with copper and that coating has a negligible effect on the surface area of the cathode. What is the mass of the cathode after coating is complete?