Social Media Management intermediate
Explain how an acetate buffer responds separately to added NaOH and added HCl.
Answer
Added hydroxide is neutralized as acetic acid supplies hydrogen ions, producing water and acetate. Added hydrogen ions from HCl are accepted by acetate, producing acetic acid. These reactions reduce the change in pH.
Explanation
The buffer’s acid component and conjugate base counteract opposite additions. Acetic acid helps neutralize added hydroxide; acetate binds added hydrogen ions. Because the added species are consumed by buffer components, pH changes less than it would in an unbuffered solution. **Key takeaway:** Buffers resist both acid and base additions. **Glossary:** Acetate: conjugate base of acetic acid.
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