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In the extraction of Al, impure Al(2)O(3...

In the extraction of Al, impure `Al_(2)O_(3)` is dissolved in conc. NaOH to form sodium aluminate and leaving impurities behind. What is the name of this process?

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This is called leaching. `Al_(2)O_(3)` dissolves in conc. NaOH to form sodium aluminate. It is filtered to remove impurities.
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