Question

For a any reversible reaction. If increases concentration of reactants. Then effect on equilibrium constant:

• A. Depends on amount of concentration
• B. Unchange
• C. Decrease
• D. Increase

Answer 1

The Correct Option is B

To understand the effect of changing the concentration of reactants on the equilibrium constant of a reversible reaction, let's explore the core concepts involved:

1. Equilibrium Constant (K_eq): The equilibrium constant is a ratio of the concentrations of products to the concentrations of reactants, each raised to the power of their coefficients as per the balanced equation. It is expressed as: K_{eq} = \frac{[Products]}{[Reactants]}
2. Nature of Equilibrium Constant: The equilibrium constant is specific to a particular reaction at a given temperature. It is independent of the initial concentrations of the reactants and products.
3. Le Chatelier's Principle: While the equilibrium position may shift due to changes in concentration, pressure, or temperature, the value of the equilibrium constant remains unchanged unless there is a change in temperature. The system will adjust to accommodate these changes, but this re-equilibration will not affect K_eq.

Conclusion: Increasing the concentration of reactants will cause the equilibrium position to shift towards the products to maintain equilibrium (according to Le Chatelier's Principle), but the equilibrium constant itself remains unchanged. Therefore, the correct answer is "Unchange."