Electrolysis in industries                                                                        Date:_______________

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Electroplating of copper on an iron spoon
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Electrolysis in industries

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Electrolysis in industries

  1. 1. Electrolysis in industries Date:_______________ Applications: 1) Purification of metals 2) Electroplating of metals 3) Extraction of metals (H/W: draw Figure 6.4 & make own notes form Text Book, pg.102) 1) Purification of metals (E.g: copper )  Electrolyte : a solution of the metal ions (E.g: Copper (II) Sulphate solution )  Anode : impure metal_____________ (E.g: impure copper )  Cathode : pure metal____________ __ (E.g: pure copper ) Description: During the electrolysis: impure copper as the anode: pure copper as the cathode. The impure copper plate (anode) dissolves and the impurities fall to the bottom of the beaker/container. Cu → Cu2+ + 2e- At the pure copper plate (cathode), the copper (II) ions are discharged. A layer of copper is deposited on the anode plate. Cu2+ + 2e- → Cu 2) Electroplating of metals. Electroplating = a process of depositing a layer of metal on another substance using electrolysis. Purposes:  To make the object more resistant to corrosion. (To protect the object to be plated from corrosion)  To make the object look more attractive. (To give the object a more attractive appearance)  Electrolyte : a solution of the plating metal ion (E.g: copper (II)sulphate solution)  Anode : Pure plating metal (E.g: Pure copper)  Cathode : Object to be electroplated (E.g: iron spoon/ key/coins) Description: During the electrolysis: pure copper as the anode: iron spoon as the cathode. The pure copper (anode) dissolves to form copper(II) ions. Cu → Cu2+ + 2e- At the iron spoon (cathode), the copper (II) ions are discharged. A layer of copper is deposited on the surface of the iron spoon. Cu2+ + 2e- → Cu Electroplating of the iron spoon copper occurs.
  2. 2. Electroplating of copper on an iron spoon

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