Make up the reaction equation: a) Fe – Fe (OH) 3 – Fe2O3 – Fe b) Fe – FeCl3 – Fe2O3 – Fe (NO3) 3

We compose the reaction equations:
a) 2Fe + O2 + 2H2O = 2Fe (OH) 2 – the process of corrosion of the metal iron;
4Fe (OH) 2 + 2H2O + O2 = 4Fe (OH) 3 – ОВР;
2Fe (OH) 3 = Fe2O3 + 3H2O – decomposition:
Fe2O3 + 3Mg = 2Fe + 3MgO – magnesium heat;
b) 2Fe + 6HCl = 2FeCl3 + 3H2 – ОВР;
FeCl3 + 3KOH = Fe (OH) 3 + 3KCl – ion exchange;
2Fe (OH) 3 = Fe2O3 + 3H2O – decomposition;
Fe2O3 + 6HNO3 = 2Fe (NO3) 3 + 3H2O – ion exchange;
The equations show the relationship between the classes of inorganic compounds: metal, base, oxide, salt.