Q. The pH of a mixture of 50 mL of 0.1 M CH₃COOH (Ka = 1.8 × 10⁻⁵) and 50 mL of 0.1 M CH₃COONa is closest to:

0.1 M CH₃COOH (Ka = 1.8 × 10⁻⁵) के 50 mL और 0.1 M CH₃COONa के 50 mL के मिश्रण का pH निकटतम है:

4.7

5.0

7.0

9.3

This is a buffer solution, so apply Henderson-Hasselbalch:

\text{pH} = pKa + \log\left(\frac{[\text{salt}]}{[\text{acid}]}\right)

pKa = -\log(1.8 × 10^{-5}) ≈ 4.74,\; \text{and} \log(1) = 0 \Rightarrow \text{pH} ≈ 4.74 ≈ \boxed{4.7}

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