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When small amount of an acid or alkali i...

When small amount of an acid or alkali is mixed with a buffer solution, then pH of buffer solution

A

does not changes

B

Changes slightly

C

Increases

D

Decreases

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question "When a small amount of an acid or alkali is mixed with a buffer solution, then the pH of the buffer solution...", we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Buffer Solutions**: - A buffer solution is defined as a 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. **Effect of Adding Acid**: - When a small amount of acid (H⁺ ions) is added to a buffer solution, the weak base present in the buffer will react with the added H⁺ ions to form its conjugate acid. This reaction minimizes the increase in H⁺ concentration, thus limiting the change in pH. 3. **Effect of Adding Base**: - Conversely, when a small amount of base (OH⁻ ions) is added, the weak acid in the buffer will react with the OH⁻ ions to form water and its conjugate base. This reaction helps to neutralize the added base, again limiting the change in pH. 4. **Conclusion on pH Change**: - While the pH of the buffer solution does change when small amounts of acid or base are added, the change is very slight. The buffer's ability to resist significant changes in pH is what defines its effectiveness. 5. **Final Answer**: - Therefore, the pH of the buffer solution changes slightly when a small amount of an acid or alkali is mixed with it.
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