Types of Equilibrium
The equilibrium between different chemical species present in the same or different phases is called chemical equilibrium. There are two types of chemical equilibrium.
Homogeneous equilibrium: The equilibrium reactions in which all the reactants and the products are in the same phase are called homogeneous equilibrium reactions.
(2) Heterogeneous equilibrium: The equilibrium reactions in which the reactants and the products are present in different phases are called heterogeneous equilibrium reactions.
Relationship between equilibrium constant and ΔG°
ΔG for a reaction under any condition is related with ΔG° by the relation,
ΔG = ΔG° + 2.303 RTlog Q
Standard free energy change of a reaction and its equilibrium constant are related to each other at temperature T by the relation ΔG = 2.303 RT log K,
For a general reaction a = 1.
For gases: a = pressure of gas in atm.
For components in solution: a = molar concentration.