Equilibrium constant is a quantitative measure that expresses the ratio of product concentrations to reactant concentrations at a specific temperature, once a chemical reaction has reached equilibrium. It indicates the extent to which a reaction proceeds in the forward or reverse direction.

Here are some general characteristics of the equilibrium constant expression:

1. Kc only works in equilibrium.
2. Important characteristics of equilibrium constant expression are as follows Kc only works in equilibrium
3. It represents the equilibrium concentration of the reactant and product in mol.dm^-3 Sindh Kc varies with temperature.
4. Kc is independent of reactant and product concentrations.
5. Kc is a balanced chemical equation coefficient. In a balanced chemical equation each reactant and product has a concentration equal to its coefficient
6. Kc represents equilibrium position. If Kc is larger than 1, the reaction is forward. If Kc is less than 1, the reaction is a reverse reaction.
7. Remember that equilibrium constant Kc is a ratio of reactant to product that is utilized to define chemical behavior.