In chemistry, an aluminate is a compound containing an oxyanion of aluminium, such as sodium aluminate. In the naming of inorganic compounds, it is a suffix that indicates a polyatomic anion with a central aluminium atom.
In chemistry, an aluminate is a compound containing an oxyanion of aluminium, such as sodium aluminate. In the naming of inorganic compounds, it is a suffix that indicates a polyatomic anion with a central aluminium atom.
==Aluminate oxyanions== Aluminium oxide (alumina) is amphoteric: it dissolves in both bases and acids. When dissolved in bases it forms hydroxyaluminate ions in the same way as aluminium hydroxide or aluminium salts. The hydroxyaluminate or hydrated aluminate can be precipitated and then calcined to produce anhydrous aluminates. Aluminates are often formulated as a combination of basic oxide and aluminium oxide, for example the formula of anhydrous sodium aluminate NaAlO2 would be shown as Na2O·Al2O3. A number of aluminate oxyanions are known: The simplest is the approximately tetrahedral found in the compound Na5AlO4, framework ions in anhydrous sodium aluminate NaAlO2 and monocalcium aluminate, CaAl2O4 made up of corner-sharing {AlO4} tetrahedra. A ring anion, the cyclic anion, found in tricalcium aluminate, Ca3Al2O6, which can be considered to consist of 6 corner sharing {AlO4} tetrahedra. A number of infinite chain anions in the compounds Na7Al3O8 which contains rings linked to form chains, Na7Al13O10 and Na17Al5O16 which contain discrete chain anions.
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