By adding a strong acid to the buffer solution, the pH of the buffer solution

Options

A. Remains constant
B. Increases
C. Decreases
D. Becomes zero

Explanation

To solve the question regarding the effect of adding a strong acid to a buffer solution, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Buffer Solutions**:
- A buffer solution is a special type of solution that resists changes in pH when small amounts of acid or base are added. It typically consists of a weak acid and its conjugate base or a weak base and its conjugate acid.

2. **Identify the Effect of Strong Acid**:
- When a strong acid is added to a buffer solution, the strong acid will dissociate completely into its ions. However, the buffer solution will react with the added hydrogen ions (H⁺) from the strong acid.

3. **Buffer Action**:
- The weak acid present in the buffer will neutralize the added H⁺ ions. This reaction helps to maintain the pH of the solution relatively constant despite the addition of the strong acid.

4. **Conclusion**:
- Therefore, the pH of the buffer solution will not change significantly upon the addition of a strong acid. This is a key characteristic of buffer solutions.

5. **Final Answer**:
- The pH of the buffer solution remains relatively unchanged upon the addition of a strong acid.