When a catalyst is added to a reversible reaction in equilibrium state, the value of equilibrium constant
Correct answer: B. does not change
- A. increases
- B. does not change
- C. decreases
- D. becomes zero
Explanation
When a catalyst is added to a reversible reaction in an equilibrium state, the value of the equilibrium constant (Kc) remains the same. This is because a catalyst only speeds up the rate of the forward and reverse reactions equally, and does not affect the position of the equilibrium. A catalyst lowers the activation energy required for the reaction to occur, which increases the rate of both the forward and reverse reactions. As a result, the system reaches equilibrium faster, but the concentrations of the reactants and products at equilibrium remain the same. Therefore, the value of Kc remains unchanged.
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About Chemical Equilibrium
Reversible reactions reach dynamic equilibrium when forward and reverse rates become equal, and Le Chatelier's principle predicts the effect of changing concentration, pressure or temperature. The chapter also covers solubility product, the common ion effect, buffer action and the conditions used in Haber's process, with equilibrium shifts distinguished from changes in the equilibrium constant.
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