Presentation on theme: "ELECTROLYSIS IN IDUSTRY EXTRACTION OF METALS PURIFICATION OF METALS"— Presentation transcript:
1 ELECTROLYSIS IN IDUSTRY EXTRACTION OF METALS PURIFICATION OF METALS ELECTROCHEMISTRYELECTROLYSISMOLTEN COMPOUNDSAQUEOUS SOLUTIONELECTROLYSIS IN IDUSTRYEXTRACTION OF METALSPURIFICATION OF METALSELECTROPLATING OF METALSVOLTAIC CELLELECTROCHEMICAL SERIES
4 Substance that can conduct electricity in molten/ aqueous solution Process-a compound is decomposed into its constituents elements when electric current passes through an electrolyteELECTROLYSISSubstance that can conduct electricity in molten/ aqueous solutionUndergo chemical changesELECTROLYTEConductors in the form of wires, rods, or plates.It passes electricity through the electrolyte during electrolysisInert: do not take part in chemical reactionse.g: carbon & platinumActive : take part in chemical reactione.g: copper, silver, mercuryCathode: negative terminalAnode: positive terminalELECTRODE
14 Example: Example 1: 0.5 mol dm3 of potassium chloride, KCl solution Cations : K+ and H+Anions : Cl-and OH-Cathode (negative electrode): H+ move to the cathode (ions are selectively discharge)Anode (positive electrode): OH- move to the anode (ions are selectively discharge)
15 Example 2:0.1 mol dm3 of copper(II) sulphate, CuSO4 solutionPositive ions (cations): copper ions (Cu2+) and hydrogen ions (H+)Negative ions (anions): sulphate ions (SO42-) and hydroxide ions (OH-)Cathode (negative electrode): Cu2+ move to the cathode (ions are selectively discharge)Anode (positive electrode): OH- move to the anode (ions are selectively discharge)
16 Concentration of Ions in electrolyte Ion that have high concentration in electrolyte will be discharged.
17 Electrolysis 2.0 mol dm-3 of lead(II) bromide, PbCl2 solution Cathode:2H⁺ +2e⁻H₂Anode:2Cl⁻ Cl2+ 2e⁻CARBONCARBONif 2 ions are placed very far apart in the ECS, the concentration aspect become insignificant.Cl⁻Pb2⁺OH⁻H⁺Pb2Cl⁻H⁺OH⁻
18 Inert electrodes: Carbon and platinum (Both of these electrodes do not react with the electrolytes or products of electrolysis)Active electrodes: Silver, copper and nickel (Active anode ionizes and concentration of cations in the electrolyte does not change)
19 Electrolysis of CuSO4 Cathode: Anode: Cu2⁺ +2e⁻Cu CuCu2⁺ + 2e⁻ c o p OH⁻H⁺Cu2⁺SO42⁻H⁺OH⁻
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