The pK_b of dimethylamine and pK_a of acetic acid are 3.27 and 4.77 respectively at T(K) . The correct option for the pH of dimethyl ammonium acetate - Chemistry MCQ NEET 2021 2026 | ExamTest.live

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The p K_{b} of dimethylamine and p K_{a} of acetic acid are 3.27 and 4.77 respectively at T (K) . The correct option for the p H of dimethyl ammonium acetate solution is:

Solution & Step-by-step Explanation

Dimethyl ammonium acetate is a salt of a weak acid (Acetic acid) and a weak base (Dimethylamine).The p H of a salt of weak acid and weak base is given by the formula: p H = 7 + \frac{1}{2} (p K_{a} - p K_{b}) Given p K_{a} = 4.77 and p K_{b} = 3.27 : p H = 7 + \frac{1}{2} (4.77 - 3.27) p H = 7 + \frac{1}{2} (1.50) = 7 + 0.75 = 7.75

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The p K_{b} of dimethylamine and p K_{a} of acetic acid are 3.27 and 4.77 respectively at T (K) . The correct option for the p H of dimethyl ammonium acetate solution is:

7.75

6.25

8.50

5.50

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