Reactivity Series &. Ease of Extraction of A l & C u. Extracting Al. Aluminium is too high in the reactivity series to extract simply by heating with charcoal Requires electrolysis. Extracting Al. Mine the bauxite ore (contains Aluminium oxide = alumina)
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4. Perform electrolysis.
Al3+ ions are reduced by gaining 3 electrons.
Al3+ (l) + 3e- Al(s)
O2- ions are oxidised to produce oxygen gas.
2 O2-(l) O2(g) + 4e-
Overall Redox Rxn:
2CuFeS2(s) + 2SiO2(s) + 4O2(g)Cu2S(l) + 2 FeSiO3(l) + 3SO2(g)
Cu2S(l) + O2(g)2Cu(l) + SO2(g)