Equilibrium constant of a reaction does not change with `………` but changes with `……………`

Answer

To answer the question, "Equilibrium constant of a reaction does not change with `………` but changes with `……………`", we can break it down step by step.

### Step-by-Step Solution:

1. **Understanding the Equilibrium Constant (K)**:
The equilibrium constant (K) is a numerical value that expresses the ratio of the concentrations of products to reactants at equilibrium for a given reaction at a specific temperature.

2. **Factors Affecting Equilibrium Constant**:
- The equilibrium constant is influenced by changes in temperature.
- It is important to note that K is not affected by changes in concentration, pressure, or the presence of catalysts.

3. **Identifying What Does Not Change K**:
- Changes in concentration of reactants or products do not affect the equilibrium constant. This means that if we increase or decrease the concentration of either side of the reaction, the value of K remains constant.
- Similarly, changes in pressure (for gaseous reactions) do not affect the equilibrium constant unless the temperature changes.

4. **Identifying What Changes K**:
- The only factor that changes the equilibrium constant is temperature. When the temperature of the system changes, it can either increase or decrease the value of K depending on whether the reaction is exothermic or endothermic.

5. **Final Answer**:
Therefore, we can conclude that:
- The equilibrium constant of a reaction does not change with **concentration or pressure** but changes with **temperature**.

### Final Statement:
Equilibrium constant of a reaction does not change with **concentration or pressure** but changes with **temperature**.