NEET Chemistry pH & Buffer Solutions MCQ Question
Calculate the pH of a 0.05 M acetic acid solution given that the ionization constant (K_a) is 1.8 × 10^-5.
74
74
5.74
6.74
Correct Answer
Detailed Explanation
Using the equation K_a = [H+][Ac-]/[HAc] and the approximation x << 0.05, we find [H+] = 1.8 × 10^-5. The pH is calculated as -log(1.8 × 10^-5) = 4.74.
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