It does not depend on the concentration. Now note there is a big difference between equilibrium constant and chemical equilibrium. Although the two things are related, they're two different separate ideas. Once again, equilibrium constant is a ratio of products to reactants, and it depends on temperature. While chemical equilibrium refers to a condition, a system. And if we add, for example, more reactants to our system now our chemical equilibrium is shifted to the right, more reactants will be produced.