The formula for aluminum hydroxide is Al(OH)3.
Aluminum hydroxide consists of aluminum (Al) and hydroxide (OH) ions. Specifically, for each aluminum ion, there are three hydroxide ions attached. The aluminum ion carries a +3 charge, and each hydroxide ion carries a -1 charge. Therefore, to balance the charges, three hydroxide ions are needed for one aluminum ion. This results in the final formula of Al(OH)3, which is commonly encountered in various applications, including as an antacid and in water purification processes.