The Equilibrium Constant

The equilibrium constant is a quantitative measure of the equilibrium point of a reaction, it is denoted
K. A value of K between 0.1 and 10 means the reaction has what could be called an equilibrium. If K
is very small it means that the reaction barely starts. If it is very large, then the reaction goes almost
to completion. The value of K for any given reaction can only be changed by the temperature at which
the reaction occurs, all other variables do not change K. K is a quotient of the concentrations of the
products (P) and reactants (R), for a reaction: