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Chemistry · PYQ NEET UG 2021
हिन्दीThe \( \text{pK}_\text{b} \) of dimethylamine and \( \text{pK}_\text{a} \) of acetic acid are 3.27 and 4.77 respectively at \( T \text{ (K)} \). The CORRECT option for the pH of dimethylammonium acetate solution is ______.
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Correct answer · Option B
7.75
Explanation
For a salt of weak acid and weak base, \( \text{pH} = 7 + \frac{1}{2}(\text{pK}_\text{a} - \text{pK}_\text{b}) = 7 + \frac{1}{2}(4.77 - 3.27) = 7 + 0.75 = 7.75 \).
