8. Ammonium benzoate is a salt formed from ammonia (NH3) and benzoic acid
(C6H5COOH). Calculate the pH of a 0.10 M solution of ammonium benzoate at 25
℃. (Ka = 6.4 x for C6H5COOH, Kb = 1.8 x for NH3; log2 = 0.301; 10g3 =
0.477; log7 = 0.845) (A) 4.74 (B) 5.96 (C) 6.73 (D) 7.28 (E) 8.04