hydroxoaluminates

Hydroxoaluminates are a class of chemical compounds containing aluminum, oxygen, and hydrogen. They are often encountered in aqueous solutions where aluminum ions react with hydroxide ions. The exact composition and structure of hydroxoaluminates in solution are complex and can vary depending on factors such as pH, concentration, and temperature. In highly alkaline solutions, aluminum hydroxide dissolves to form various anionic hydroxoaluminate species.

These species can include monomeric ions like [Al(OH)4]− (tetrahydroxoaluminate) as well as polymeric or oligomeric forms. The equilibrium between these different species is dynamic. In less alkaline or neutral conditions, aluminum tends to precipitate as aluminum hydroxide, Al(OH)3, which is an amphoteric substance. This means it can react with both acids and bases.

Hydroxoaluminates play a role in several natural and industrial processes. For instance, they are relevant in the chemistry of soils and natural waters, affecting aluminum mobility and speciation. In industrial applications, their properties are utilized in water treatment, where they can act as flocculants to remove impurities. They are also involved in the production of zeolites and other aluminosilicate materials. The study of hydroxoaluminates is important for understanding the behavior of aluminum in various chemical environments.