Basic aluminium salt
# Basic aluminium salt

Basic aluminium (or basic aluminum) is the name of more than one functional group consisting of aluminium with one or two hydroxy groups attached.

Dihydroxyaluminium, $Al(OH)_2,$ also known as dibasic aluminium, is monovalent, and known in these compounds:

* Dihydroxyaluminium acetate, $(HO)_2AlCH_3CO_2,$ also known as aluminium monoacetate, basic aluminium monoacetate, dibasic aluminium acetate
* Dihydroxyaluminium sodium carbonate
* Aloglutamol, tris(hydroxymethyl)aminomethanegluconate dihydroxyaluminate
* Aluminium monostearate
* Carafate
* Sucralfate

Hydroxyaluminium, Al(OH), also known as monobasic aluminium or basic aluminium, is divalent, and known in these compounds:

Aluminium, Al, is trivalent. Aluminium triacetate, $Al(CH_3CO_2)_3,$ is a complete molecule without any hydroxy groups, so it is not a "basic aluminium" compound.

Aluminium hydroxide, $Al(OH)_3,$ aluminium with three hydroxy groups attached, is a complete molecule, so it is not a "basic aluminium" compound.

Aluminium acetate is a name for three salts in the solid state: dihydroxyaluminium aluminium acetate, hydroxyaluminium diacetate, and aluminium triacetate, $Al(CH_3CO_2)_3.$ In aqueous solution, aluminium triacetate hydrolyses to form a mixture of the other two, so all solutions of all three can be referred to simply as "aluminium acetate", as the species co-exist and inter-convert in chemical equilibrium.

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