Addition of CH3COOH and CH3COONa gives in water_______________?
Correct answer: D. both B & C
- A. Standard solution
- B. buffer solution
- C. acidic buffer solution
- D. both B & C
Explanation
CH3COOH is a weak acid and CH3COONa supplies its conjugate base, CH3COO-, so their mixture forms an acidic buffer. It is not merely a standard solution, because its important property is resistance to pH change. Students may select only b and miss c, but the mixture is both a buffer solution and specifically an acidic buffer.
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About Buffer Solutions
Buffer solutions resist changes in pH when small amounts of acid or base are added, using a weak acid and its conjugate base or a weak base and its conjugate acid. Work includes buffer action, the common-ion effect, Henderson-Hasselbalch calculations, buffer capacity, and the difference between acidic and basic buffers.
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