NEET Chemistry pH & Buffer Solutions MCQ Question
Calculate the pH of a buffer solution containing 0.1 M acetic acid and 0.1 M sodium acetate. Given that the ionization constant of acetic acid is 1.74 × 10⁻⁵.
pH = 4.74
pH = 5.00
pH = 3.00
pH = 7.00
Correct Answer
Detailed Explanation
Using the Henderson-Hasselbalch equation, pH = pKa + log([Salt]/[Acid]). Since [Salt] = [Acid], pH = pKa = -log(1.74 × 10⁻⁵) which is approximately 4.74.
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