Aluminium in excess sodium hydroxide

Aluminium in excess sodium hydroxide

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This image is part of the sequence science and technology: aluminium ion test

Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: Aluminium in excess sodium hydroxide. When sodium hydroxide is added to a solution of aluminium sulphate, a white precipitate of aluminium hydroxide forms (see C019/9198). The addition of excess sodium hydroxide causes the formation of a clear solution of sodium aluminate. Together with the use of ammonia (where the same precipitate forms but excess ammonia fails to remove the precipitate), these reactions can be used to test for the presence of the aluminium ion.

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