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A salt formed when aluminium hydroxide or γ-alumina is dissolved in solutions of strong bases, such as sodium hydroxide. Aluminates exist in solutions containing the aluminate ion, commonly written [Al(OH)4]. In fact the ion probably is a complex hydrated ion and can be regarded as formed from a hydrated Al3+ ion by removal of four hydrogen ions:[Al(H2O)6]3++4OH → 4H2O+[Al(OH)4(H2O)2] Other aluminates and polyaluminates, such as [Al(OH)6]3− and [(HO)3AlOAl(OH)3]2−, are also present. See also aluminium hydroxide.

[Al(H2O)6]3++4OH → 4H2O+[Al(OH)4(H2O)2]

Subjects: Chemistry.

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