A reversible chemical reaction having two reactants in equilibrium. If the concentrations of the reactants are doubled, then the equilibrium constant will
Correct answer: D. Remain the same
- A. Also be doubled
- B. Be halved
- C. Become one-fourth
- D. Remain the same
Explanation
The equilibrium constant, KC, is a fixed value for a specific reaction at a given temperature. It reflects the ratio of the concentrations of products to reactants at equilibrium, raised to the power of their respective stoichiometric coefficients. Changes in the concentrations of the reactants or products do not alter the value of KC. Therefore, if the concentrations of the reactants are doubled, the equilibrium constant remains the same.Options A, B, and C are incorrect because they suggest that the equilibrium constant changes with concentration changes, which is not true. The value of KC is constant unless the temperature changes.
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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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