Question

according to le chatelier’s principle, which statement is true?
the equilibrium constant is unchanged by temperature changes.
the equilibrium constant changes with a change in temperature.
the equilibrium constant increases with the concentration of reactants.
the equilibrium constant decreases with the concentration of products.

Explanation:

• For the first option: The equilibrium constant ($K$) is dependent on temperature. For example, in an exothermic reaction, increasing temperature decreases $K$, and in an endothermic reaction, increasing temperature increases $K$. So this statement is false.
• For the second option: Temperature affects the equilibrium constant because it is related to the energy of the reaction. A change in temperature changes the relative amounts of reactants and products at equilibrium, thus changing $K$. This statement is true.
• For the third option: The equilibrium constant is not affected by the concentration of reactants. Changing reactant concentration will shift the equilibrium position (by Le Chatelier's principle to re - establish equilibrium) but not the value of $K$. So this statement is false.
• For the fourth option: Similarly, the concentration of products does not change the equilibrium constant. A change in product concentration will shift the equilibrium position, but $K$ remains the same at a given temperature. So this statement is false.

Answer:

B. The equilibrium constant changes with a change in temperature.