铝三角:
Al3+ + 3OH- = Al(OH)3 (s)
Al(OH)3 + 3H+ = Al3+ + 3H2O
Al(OH)3 + OH- = AlO2- + 2H2O
AlO2- + H+ + H2O = Al(OH)3 (s
Al3+ + 4OH- = AlO2- + 2H2O
AlO2-+ 4H+ = Al3+ + 2H2O s
铁三角
Fe + 2H+ = Fe2+ + H2 (g)
Fe2+ + Zn = Fe + Zn2+
Fe2+ + Cl2 = 2Fe3+ + 2Cl-
Fe3+ + Fe = 3Fe2+ Cu
2Fe + 3Cl2 = 2Fe3+ + 6Cl-
2Fe3+ + 3Zn = 2Fe + 3Zn2+