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)
2Fe(OH)3 = Fe2O3 + 3H2O
Fe2O3 + 6HCl = 2FeCl3 + 3H2O
3NaOH + FeCl3 = Fe(OH)3 + 3NaCl
Fe(OH)3 + 3HNO3 = Fe(NO3)3 + 3H2O