Types of Chemical Equilibria

Types Of Chemical Equilibria

1) Homogeneous Equilibria

When in an equilibrium reaction, all the reactants and the products are present in the same phase , it is called homogeneous equilibrium.

Type 1 : In which the number of moles of products is equal to the number of moles of reactants

H₂ + I₂  2HI

N₂ + O₂  2NO

CO + H₂O  CO₂ + H₂

Type 2 : In which the number of moles of products is not equal to the number of moles of reactants

N₂ + 3H₂    2NH₃

2SO₂ + O₂  2SO₃

PCl₅  PCl₃ + Cl₂

The reactions in the liquid phase are:

CH₃COOH + C₂H₅OH  CH₃COOC₂H₅ + H₂O

2)Heterogeneous Equilibria

When in an equilibrium reaction, all the reactants and the products are present in two or more than two phases , it is called heterogeneous equilibrium.

CaCO₃ ( s )  CaO ( s ) + CO₂ ( g )

3Fe ( s ) + 4H₂O ( g )  Fe₃O₄ (s ) + 4H₂ ( g )