q how can we obtain pure aluminapure alumina is, Chemistry

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q how can we obtain pure aluminapure alumina is

Q. How can we obtain Pure alumina?

Pure alumina is obtained from bauxite ore. Powdered bauxite mineral is heated in a concentrated solution of sodium hydroxide under pressure when alumina and silica get dissolved:

Al₂0₃ + 2NaOH + 3H₂0---------------------------------> 2 NaAI(OH)₄

Si0₂+ 2NaOH ------------------------------------------> Na₂Si0₃ + H₂0

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