Equilibrium constant is the ratio between the molar concentrations of the products and the molar concentrations of the reactions. Equilibrium constant plays a very important role in determining the extent till which equilibrium is attained for a chemical reaction. Equilibrium constant calculator is the instant tool which can calculate the value of it.
Example 1: Write the expressions for equilibrium constant for the given chemical reactions:
a) Na+1(aq) + Cl-1(aq)èNaCl(aq)
Equilibrium constant, Kc = [NaCl]/ ([Na+1] * [Cl-1])
b) 2SO2(g) + O2(g) è 2SO3(g)
Equilibrium constant, Kc = [SO3]2/ ([SO2]2 * [O2])
c) CaCO3(s)èCaO(s) + CO2(g)
Equilibrium constant, Kc = [CO2]
Here for the above reaction we do not consider CaO or CaCO3 because they are in solid state and for the Equilibrium constant formula, solids are not included.
Example 2: Given the reaction N2(g) + H2(g) > NH3(g). Find the equilibrium constant for this reaction if the molar concentrations given are:
[NH3]= 0.100M, [N2] = 0.05M and [H2] = 0.01M
The balanced chemical reaction is: N2(g) + 3H2(g) > 2NH3(g)
The Equilibrium constant of a chemical equation represented by Kc for this reaction is:
Kc = [NH3]2/ ([N2] * [H2]3)
Kc = (0.100)2/ (0.05 * 0.013)
Kc = 2.00 * 105