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Equilibrium Constant Calculator

# Equilibrium Constant Calculator

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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