■ Uses of electrolysis in industry
► | The extraction of metals | |
► | The purification of metals | |
► | Electroplating of metals |
■ Extraction of metals
► | Electrolysis can be used to extract metals from their ores. | |
► | Used to extract metals that are more reactive than carbon - potassium, sodium, calcium, magnesium and aluminium. |
► | Extract from its ore, bauxite, which contains aluminium oxide(Al2O3) | |||||||||||||
► | Molten aluminium oxide is mixed with crylolite to lower its melting point. | |||||||||||||
► | Electrolysed by using carbon electrodes.
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■ Purification of metals
► | Electrolysis can be used to purify the impure metal. | |
► | Cathode : pure metal, anode : impure metal | |
► | Electrolyte : a salt containing the ions of the metal being purified. |
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► | The impurities form a deposit below the anode. |
■ Electroplating of metals
► | Electrolysis can be used to put a metallic coating on an object. | |
► | Cathode : object to be plated, anode : metal that is used to plate the object. | |
► | Electrolyte : a salt containing the ions of the metal used as anode. |
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⇲ For exercise(objective and subjective), download for free on Android OS. | ||
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