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 dimethylammonium acetate solution is:

Step-by-step solution

pk b of dimethylamine = 3 . 27 pk a of acetic acid = 4 . 77 Dimethylammonium acetate is salt of weak acid and weak base for which pH is: pH = 7 + 1 2 pk a - 1 2 pK b = 7 + 1 2 × 4 . 77 - 1 2 × 3 . 27 = 7 . 75