Al3+ + 3OH- = Al(OH)3↓
Al(OH)3 + OH- =AlO2- + 2H2O
Al3+ + 4OH- = AlO2- + 2H2O
Al(OH)3 + 3H+ = Al3+ + 3H2O
AlO2- + H+ + H2O = Al(OH)3↓
AlO2- + 4H+ = Al3+ + 2H2O
Al3+ + 3AlO2- + 6H2O=4Al(OH)3↓