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Test: Add aqueus sodium carbonate solution, then warm it.

Observation: Formation of white precipitate.

Deduction: The presence of aluminum ions, Al3+

Or

Test: Observation:

Add aqueous sodium hydroxide White precipitate occur

Add aqueous sodium hydroxide (excess) & warm White precipitate solute

Test with red litmus paper Changes red - blue

Deduction: The presence of aluminum ions, Al3+

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