1) FeSO4 (aq) -> Fe(OH)2 (s) + H2SO4 (aqFe(OH)2 (s) + 2HCl (aq) -> FeCl2 (aq) + 2H2O (l)
2) FeCl3 (aq) + 3NaOH (aq) -> Fe(OH)3 (s) + 3NaCl (aqFe(OH)3 (s) + 3H2SO4 (aq) -> Fe2(SO4)3 (aq) + 3H2O (lFe2(SO4)3 (aq) + 6KSCN (aq) -> 2Fe(SCN)6 (aq) + 3K2SO4 (aq)
3) AlCl3 (aq) + 3NaOH (aq) -> Al(OH)3 (s) + 3NaCl (aqAl(OH)3 (s) + 3HNO3 (aq) -> Al(NO3)3 (aq) + 3H2O (lAl(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)