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Chemical equilibrium is a state achieved in a reversible chemical reaction in which the forward and backward reactions happen at the same rate as each other and there is no net change in the concentrations of the reactants and the products.

In a chemical reaction, the reactants react with each...

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Chemical equilibrium is a state achieved in a reversible chemical reaction in which the forward and backward reactions happen at the same rate as each other and there is no net change in the concentrations of the reactants and the products.

In a chemical reaction, the reactants react with each other and give rise to the products (forward reaction). When a chemical reaction is reversible, the products can also react and form the original reactants (backward or reverse reaction). When a reversible chemical reaction takes place inside a closed system, the reactants and products cannot escape the system and continue to undergo the reaction. The reactants keep forming the products, and the products keep forming the reactants back at the same rate, and, thus, their concentrations do not change. At this stage, we say that the reactants and products have reached equilibrium.

At equilibrium, it looks like the chemical reaction is complete. But note that the chemical reaction does not actually stop at equilibrium, as the forward and the backward reactions are still continuously happening. Equilibrium is, thus, dynamic in nature.

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