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Aluminium cation is acidic. Why?...

Aluminium cation is acidic. Why?

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Aluminium cation, `Al^(3+)` has empty orbitals available to accept electrons. Hence, `Al^(3+)` ion is a Lewis acid. `Al^(3+)` cation forms complex ions like `[AlF_(6)]^(3-) ,[Al(OH)_4(H_2 O)_2 ]^(-)`, etc.` [Al^(3+) +6F^(-) to (AIF_(6))]^(3+)`
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