1) FeSO4 + 2NaOH = Fe(OH)2 + Na2SO4
2) Fe(OH)2 = FeO + H2O
3) 4Fe(OH)2 + O2 + 2H2O = 4Fe(OH)3
4) Fe(OH)3 + 3HCl = FeCl3 + 3H2O
5) Fe(OH)3 + 3NaOH = Na3[Fe(OH)6]
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Answers & Comments
1) FeSO4 + 2NaOH = Fe(OH)2 + Na2SO4
2) Fe(OH)2 = FeO + H2O
3) 4Fe(OH)2 + O2 + 2H2O = 4Fe(OH)3
4) Fe(OH)3 + 3HCl = FeCl3 + 3H2O
5) Fe(OH)3 + 3NaOH = Na3[Fe(OH)6]