Key Characteristics of Equilibrium
* Forward and Reverse Rates are Equal: The rate at which reactants are turning into products (forward reaction) is exactly the same as the rate at which products are turning back into reactants (reverse reaction). This means there is no net change in the amounts of reactants and products.
* Constant Concentrations: While the reactions continue, the concentrations of reactants and products remain constant over time.
* Dynamic Process: Equilibrium is not a static state where reactions stop. It's a dynamic balance where the forward and reverse reactions are happening at the same rate, resulting in no observable change.
* Reversible Reactions: Equilibrium is only possible for reactions that are reversible. This means that the products can react to form reactants again.
* Equilibrium Constant (Kc): A specific ratio of product concentrations to reactant concentrations at equilibrium, which is constant for a given temperature.
Example
Imagine a reaction where A + B <=> C + D
At equilibrium:
* The rate of A + B turning into C + D is the same as the rate of C + D turning into A + B.
* The concentrations of A, B, C, and D remain constant.
Important Note: While the concentrations are constant at equilibrium, they don't necessarily have to be equal. The relative amounts of reactants and products at equilibrium depend on the equilibrium constant for the reaction.
