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20/09/2021 9:23 pm
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The pKb of dimethylamine and pKa of acetic acid are 3.27 and 4.77 respectively at T (K). The correct option for the pH of dimethylammonium acetate solution is:
(1) 8.50
(2) 5.50
(3) 7.75
(4) 6.25
1 Answer
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20/09/2021 9:26 pm
Correct answer: (3) 7.75
Explanation:
Dimethyl ammonium acetate is a weak acid & weak base type of salt
pH = 7 + \(\frac{1}{2}\)pKa - \(\frac{1}{2}\)pKb
= 7 + \(\frac{1}{2}\) x 4.77 - \(\frac{1}{2}\) x 3.27
= 7.75