$Fe_{2}O_{3}+3H_{2} \to 2Fe+3H_{2}O$
$Fe+H_{2}SO_{4} \to FeSO_{4}+H_{2} \uparrow$
$FeSO_{4}+BaCl_{2} \to BaSO_{4} \downarrow+FeCl_{2}$
$FeCl_{2}+2NaOH \to 2NaCl+Fe(OH)_{2}$
$Fe(OH)_{2}+2H_{2}O+O_{2} \to Fe(OH)_{3}$
$2Fe(OH)_{3} \to Fe_{2}O_{3}+3H_{2}O$
$Fe_{2}O_{3}+3H_{2}SO_{4} \to Fe_{2}(SO_{4})_{3}+3H_{2}O$
$2Fe+6H_{2}SO_{4} \to Fe_{2}(SO_{4})_{3}+3SO_{2} \uparrow+6H_{2}O$
$Fe_{2}(SO_{4})_{3}+Fe \to 3FeSO_{4}$
$Fe_{2}(SO_{4})_{3}+6NaOH \to 3Na_{2}SO_{4}+2Fe(OH)_{3}$
