What is the formula of the ionic compound formed when aluminum ion reacts with carbonate ion? And why?The compound carbonate, CO3 has a charge of 2-Aluminum, Al, has a charge of 3+ Carbonate needs 2 electrons, and aluminum has 3 to giveThe minimum number of each element you can have and use up all the electrons is 3 CO3\'s and 2 Al\'sso the formula would be Al2(CO3)3Other related question