buffer solution

Question

A buffer solution of pH 4.76 can be prepared by mixing:

RankGuru · Accepted Answer

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 ($CH_3COOH$)** and **Sodium Acetate ($CH_3COONa$)**.
- The $pK_a$ of acetic acid at $25^\circ C$ is exactly **$4.76$**.
- According to the Henderson-Hasselbalch equation: $pH = pK_a + \log([Salt]/[Acid])$.
- If salt and acid are in equal molar concentrations, $pH = pK_a = 4.76$.

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