Buffer Solution
A buffer solution of pH 4.76 can be prepared by mixing:
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About This Question
- Subject
- chemistry
- Chapter
- principles related to practical chemistry
- Topic
- buffer solution
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
CH₃COOH and CH₃COONa
A Buffer Solution resists changes in pH.
- Acidic Buffer: Produced by mixing a Weak Acid and its salt with a strong base.
- Example: Acetic Acid (CH3COOH) and Sodium Acetate (CH3COONa).
- The pKa of acetic acid at 25∘C is exactly 4.76.
- According to the Henderson-Hasselbalch equation: pH=pKa+log([Salt]/[Acid]).
- If salt and acid are in equal molar concentrations, pH=pKa=4.76.
This medium difficulty chemistry question is from the chapter principles related to practical chemistry, covering the topic of buffer solution. It appeared in the 2025 exam.
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