Aluminium is a chemical element in the boron group with symbol Al and atomic number 13. Aluminum has three oxidation states. The most common one is +3. The other two are +1 and +2. One +3 oxidation state for Aluminum can be found in the compound aluminum oxide, Al2O3. In AlO, aluminum monoxide, it has a +2 oxidation state, and AlH has an oxidation state of +1.It is found in various salts like aluminium chloride and aluminium oxide as Al (III) ion. Aluminium ion is precipitated as its hydroxide by adding ammonium hydroxide to its solution.
This video explains how to test for the presence of aluminium ion in a given salt.