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Question
Aluminium is extracted from its chief ore, bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction.
Write three balanced equations for the purification of bauxite.
Solution
Balanced equations for the purification of bauxite:
\[\ce{Al2O3.2H2O + 2NaOH -> 2NaAlO2 + 3H2O}\]
\[\ce{NaAlO2 + 2H2O -> NaOH + Al(OH)3 ↓}\]
\[\ce{2Al(OH)3 ->[heat][1000^\circ C]Al2O3 + 3H2O}\]
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