1) FeSO4 (aq) -> Fe(OH)2 (s) + H2SO4 (aq)Fe(OH)2 (s) + 2HCl (aq) -> FeCl2 (aq) + 2H2O (l)
2) FeCl3 (aq) + 3NaOH (aq) -> Fe(OH)3 (s) + 3NaCl (aq)Fe(OH)3 (s) + 3H2SO4 (aq) -> Fe2(SO4)3 (aq) + 3H2O (l)Fe2(SO4)3 (aq) + 6KSCN (aq) -> 2Fe(SCN)6 (aq) + 3K2SO4 (aq)
3) AlCl3 (aq) + 3NaOH (aq) -> Al(OH)3 (s) + 3NaCl (aq)Al(OH)3 (s) + 3HNO3 (aq) -> Al(NO3)3 (aq) + 3H2O (l)Al(NO3)3 (aq) + NaOH (aq) -> Na[Al(OH)4] (aq) + 3HNO3 (aq)
1) FeSO4 (aq) -> Fe(OH)2 (s) + H2SO4 (aq)
Fe(OH)2 (s) + 2HCl (aq) -> FeCl2 (aq) + 2H2O (l)
2) FeCl3 (aq) + 3NaOH (aq) -> Fe(OH)3 (s) + 3NaCl (aq)
Fe(OH)3 (s) + 3H2SO4 (aq) -> Fe2(SO4)3 (aq) + 3H2O (l)
Fe2(SO4)3 (aq) + 6KSCN (aq) -> 2Fe(SCN)6 (aq) + 3K2SO4 (aq)
3) AlCl3 (aq) + 3NaOH (aq) -> Al(OH)3 (s) + 3NaCl (aq)
Al(OH)3 (s) + 3HNO3 (aq) -> Al(NO3)3 (aq) + 3H2O (l)
Al(NO3)3 (aq) + NaOH (aq) -> Na[Al(OH)4] (aq) + 3HNO3 (aq)