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: (A) 8.50 (B) 5.50 (C) 7.75 (D) 6.25

Question

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:

(A) 8.50
(B) 5.50
(C) 7.75
(D) 6.25

Prashant Kotian · Accepted Answer

Correct answer: C. Dimethylammonium acetate is a weak acid & weak base type of salt pH = a b 1 1 7 pK – pK 2 2 + = 1 1 7 4.77 – 3.27 2 2 + ´ ´ = 7.75

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