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Na-na2o-naoh-fe(oh)3-fe2o3-fecl3-fe(oh)3-fe2(so4)3
4Na + O₂ = 2Na₂O Na₂O + H₂O = 2NaOH 3NaOH + Fe(NO₃)₃ = Fe(OH)₃ + 3NaNO₃ 2Fe(OH)₃ = Fe₂O₃ + 3H₂O Fe₂O₃ + 6HCl = 2FeCl₃ + 3H₂O FeCl₃ + 3KOH = Fe(OH)₃ + 3KCl 2Fe(OH)₃ + 3H₂SO₄ = Fe₂(SO₄)₃ + 6H₂O